diff --git a/build.gradle b/build.gradle
index cbf22cb7..78048f6b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,6 +9,11 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
+
+//plugins{
+//    id 'org.openjfx.javafxplugin' version '0.0.7' apply false
+//}
+
 allprojects {
     apply plugin: 'idea'
     apply plugin: 'java'
diff --git a/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/NumassFrame.kt b/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/NumassFrame.kt
index e77abd5a..329190ee 100644
--- a/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/NumassFrame.kt
+++ b/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/NumassFrame.kt
@@ -9,18 +9,19 @@ import java.time.Instant
  * Created by darksnake on 06-Jul-17.
  */
 class NumassFrame(
-        /**
-         * The absolute start time of the frame
-         */
-        val time: Instant,
-        /**
-         * The time interval per tick
-         */
-        val tickSize: Duration,
-        /**
-         * The buffered signal shape in ticks
-         */
-        val signal: ShortBuffer) {
+    /**
+     * The absolute start time of the frame
+     */
+    val time: Instant,
+    /**
+     * The time interval per tick
+     */
+    val tickSize: Duration,
+    /**
+     * The buffered signal shape in ticks
+     */
+    val signal: ShortBuffer
+) {
 
     val length: Duration
         get() = tickSize.multipliedBy(signal.capacity().toLong())
diff --git a/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/SignalProcessor.kt b/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/SignalProcessor.kt
index 22c30e01..1928d73a 100644
--- a/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/SignalProcessor.kt
+++ b/numass-core/numass-data-api/src/main/kotlin/inr/numass/data/api/SignalProcessor.kt
@@ -7,5 +7,5 @@ import java.util.stream.Stream
  * Created by darksnake on 07.07.2017.
  */
 interface SignalProcessor {
-    fun analyze(frame: NumassFrame): Stream<NumassEvent>
+    fun analyze(parent: NumassBlock, frame: NumassFrame): Stream<NumassEvent>
 }
diff --git a/numass-core/numass-signal-processing/build.gradle.kts b/numass-core/numass-signal-processing/build.gradle.kts
new file mode 100644
index 00000000..d2a314b1
--- /dev/null
+++ b/numass-core/numass-signal-processing/build.gradle.kts
@@ -0,0 +1,19 @@
+plugins {
+    idea
+    kotlin("jvm")
+}
+
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    compile(kotlin("stdlib-jdk8"))
+    compile(project(":numass-core:numass-data-api"))
+
+    // https://mvnrepository.com/artifact/org.apache.commons/commons-collections4
+    compile(group = "org.apache.commons", name = "commons-collections4", version = "4.3")
+
+}
\ No newline at end of file
diff --git a/numass-core/numass-signal-processing/src/main/kotlin/inr/numass/data/ChernovProcessor.kt b/numass-core/numass-signal-processing/src/main/kotlin/inr/numass/data/ChernovProcessor.kt
new file mode 100644
index 00000000..fedc5cd2
--- /dev/null
+++ b/numass-core/numass-signal-processing/src/main/kotlin/inr/numass/data/ChernovProcessor.kt
@@ -0,0 +1,66 @@
+package inr.numass.data
+
+import hep.dataforge.meta.Meta
+import inr.numass.data.api.NumassBlock
+import inr.numass.data.api.NumassEvent
+import inr.numass.data.api.NumassFrame
+import inr.numass.data.api.SignalProcessor
+import org.apache.commons.collections4.queue.CircularFifoQueue
+import java.nio.ShortBuffer
+import java.util.stream.Stream
+import kotlin.streams.asStream
+
+
+private fun ShortBuffer.clone(): ShortBuffer {
+    val clone = ShortBuffer.allocate(capacity())
+    rewind()//copy from the beginning
+    clone.put(this)
+    rewind()
+    clone.flip()
+    return clone
+}
+
+
+class ChernovProcessor(val meta: Meta) : SignalProcessor {
+    val threshold = meta.getValue("threshold").number.toShort()
+    val signalRange: IntRange = TODO()
+    val signal: (Double) -> Double = { TODO() }
+    val tickSize: Int = TODO()
+
+    private fun CircularFifoQueue<Short>.findMax(): Pair<Double, Double> {
+        TODO()
+    }
+
+    override fun analyze(parent: NumassBlock, frame: NumassFrame): Stream<NumassEvent> {
+        return sequence<NumassEvent> {
+            val events = HashMap<Double, Double>()
+            val buffer = frame.signal.clone()
+
+            val ringBuffer = CircularFifoQueue<Short>(5)
+            while (buffer.remaining() > 0) {
+                ringBuffer.add(buffer.get())
+                val lastValue = ringBuffer[1] ?: -1
+                val currentValue = ringBuffer[0]
+                if (lastValue > threshold && currentValue < lastValue) {
+                    //Found bending, evaluating event
+
+                    ringBuffer.add(buffer.get())//do another step to have 5-points
+                    //TODO check end of frame
+                    val (pos, amp) = ringBuffer.findMax()
+                    val event = NumassEvent(amp.toShort(), pos.toLong() * tickSize, parent)
+                    yield(event)
+
+                    //subtracting event from buffer copy
+                    for (x in signalRange) {
+                        //TODO check all roundings
+                        val position = buffer.position() - x.toShort()
+                        val oldValue = buffer.get(position)
+                        val newValue = oldValue - amp * signal(x.toDouble())
+                        buffer.put(position, newValue.toShort())
+                    }
+                }
+            }
+        }.asStream()
+    }
+}
+
diff --git a/numass-core/src/main/kotlin/inr/numass/data/analyzers/SmartAnalyzer.kt b/numass-core/src/main/kotlin/inr/numass/data/analyzers/SmartAnalyzer.kt
index 6b9d59b8..f5ed715c 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/analyzers/SmartAnalyzer.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/analyzers/SmartAnalyzer.kt
@@ -41,7 +41,7 @@ class SmartAnalyzer(processor: SignalProcessor? = null) : AbstractAnalyzer(proce
                 "simple" -> simpleAnalyzer
                 "time" -> timeAnalyzer
                 "debunch" -> debunchAnalyzer
-                else -> throw IllegalArgumentException("Analyzer not found")
+                else -> throw IllegalArgumentException("Analyzer ${config.getString("type")} not found")
             }
         } else {
             if (config.hasValue("t0") || config.hasMeta("t0")) {
diff --git a/numass-core/src/main/proto/inr/numas/numass-proto.proto b/numass-core/src/main/proto/inr/numas/numass-proto.proto
deleted file mode 100644
index 6ce6f065..00000000
--- a/numass-core/src/main/proto/inr/numas/numass-proto.proto
+++ /dev/null
@@ -1,33 +0,0 @@
-syntax = "proto3";
-
-package inr.numass.data;
-
-message Point {
-    // A single channel for multichannel detector readout
-    message Channel {
-        //A continuous measurement block
-        message Block {
-            // Raw data frame
-            message Frame {
-                uint64 time = 1; // Time in nanos from the beginning of the block
-                bytes data = 2; // Frame data as an array of int16 mesured in arbitrary channels
-            }
-            // Event block obtained directly from  device of from frame analysis
-            // In order to save space, times and amplitudes are in separate arrays.
-            // Amplitude and time with the same index correspond to the same event
-            message Events {
-                repeated uint64 times = 1; // Array of time in nanos from the beginning of the block
-                repeated uint64 amplitudes = 2; // Array of amplitudes of events in channels
-            }
-
-            uint64 time = 1; // Block start in epoch nanos
-            repeated Frame frames = 2; // Frames array
-            Events events = 3; // Events array
-            uint64 length = 4; // block size in nanos. If missing, take from meta.
-            uint64 bin_size = 5;  // tick size in nanos. Obsolete, to be removed
-        }
-        uint64 id = 1; // The number of measuring channel
-        repeated Block blocks = 2; // Blocks
-    }
-    repeated Channel channels = 1; // Array of measuring channels
-}
\ No newline at end of file
diff --git a/numass-main/build.gradle b/numass-main/build.gradle
index bdd6a545..eba39a00 100644
--- a/numass-main/build.gradle
+++ b/numass-main/build.gradle
@@ -5,6 +5,12 @@ plugins {
 
 apply plugin: 'kotlin'
 
+//apply plugin: 'org.openjfx.javafxplugin'
+//
+//javafx{
+//    modules = [ 'javafx.controls']
+//}
+
 //if (!hasProperty('mainClass')) {
 //    ext.mainClass = 'inr.numass.LaunchGrindShell'
 //}
diff --git a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
index e6097466..28077c06 100644
--- a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
+++ b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
@@ -72,7 +72,8 @@ class NumassPlugin : BasicPlugin() {
         plotFitTask,
         histogramTask,
         fitScanTask,
-        sliceTask
+        sliceTask,
+        subThresholdTask
     )
 
     @Provides(Task.TASK_TARGET)
diff --git a/numass-main/src/main/kotlin/inr/numass/subthreshold/Threshold.kt b/numass-main/src/main/kotlin/inr/numass/subthreshold/Threshold.kt
index 077dfe93..5fd5a023 100644
--- a/numass-main/src/main/kotlin/inr/numass/subthreshold/Threshold.kt
+++ b/numass-main/src/main/kotlin/inr/numass/subthreshold/Threshold.kt
@@ -10,6 +10,7 @@ import hep.dataforge.nullable
 import hep.dataforge.storage.Storage
 import hep.dataforge.tables.ListTable
 import hep.dataforge.tables.Table
+import hep.dataforge.toList
 import hep.dataforge.values.ValueMap
 import hep.dataforge.values.Values
 import inr.numass.data.analyzers.*
@@ -25,7 +26,9 @@ import org.apache.commons.math3.analysis.ParametricUnivariateFunction
 import org.apache.commons.math3.exception.DimensionMismatchException
 import org.apache.commons.math3.fitting.SimpleCurveFitter
 import org.apache.commons.math3.fitting.WeightedObservedPoint
+import org.slf4j.LoggerFactory
 import java.util.stream.Collectors
+import java.util.stream.StreamSupport
 
 
 object Threshold {
@@ -35,13 +38,13 @@ object Threshold {
         //creating storage instance
         val storage = NumassDirectory.read(context, meta.getString("data.dir")) as Storage
 
-        fun Storage.loaders(): Sequence<NumassDataLoader>{
+        fun Storage.loaders(): Sequence<NumassDataLoader> {
             return sequence<NumassDataLoader> {
                 print("Reading ${this@loaders.fullName}")
                 runBlocking { this@loaders.children }.forEach {
-                    if(it is NumassDataLoader){
+                    if (it is NumassDataLoader) {
                         yield(it)
-                    } else if (it is Storage){
+                    } else if (it is Storage) {
                         yieldAll(it.loaders())
                     }
                 }
@@ -51,19 +54,19 @@ object Threshold {
         //Reading points
         //Free operation. No reading done
         val sets = storage.loaders()
-                .filter { it.fullName.toString().matches(meta.getString("data.mask").toRegex()) }
+            .filter { it.fullName.toString().matches(meta.getString("data.mask").toRegex()) }
 
         val analyzer = TimeAnalyzer();
 
         val data = DataSet.edit(NumassPoint::class).also { dataBuilder ->
             sets.sortedBy { it.startTime }
-                    .flatMap { set -> set.points.asSequence() }
-                    .groupBy { it.voltage }
-                    .forEach { key, value ->
-                        val point = SimpleNumassPoint(value, key)
-                        val name = key.toInt().toString()
-                        dataBuilder.putStatic(name, point, buildMeta("meta", "voltage" to key));
-                    }
+                .flatMap { set -> set.points.asSequence() }
+                .groupBy { it.voltage }
+                .forEach { key, value ->
+                    val point = SimpleNumassPoint(value, key)
+                    val name = key.toInt().toString()
+                    dataBuilder.putStatic(name, point, buildMeta("meta", "voltage" to key));
+                }
         }.build()
 
         return data.pipe(context, meta) {
@@ -90,13 +93,14 @@ object Threshold {
 //        )
 
         return binned.rows
-                .map {
-                    WeightedObservedPoint(
-                            1.0,//1d / p.getValue() , //weight
-                            it.getDouble(CHANNEL_KEY), // x
-                            it.getDouble(COUNT_RATE_KEY) / binning) //y
-                }
-                .collect(Collectors.toList())
+            .map {
+                WeightedObservedPoint(
+                    1.0,//1d / p.getValue() , //weight
+                    it.getDouble(CHANNEL_KEY), // x
+                    it.getDouble(COUNT_RATE_KEY) / binning
+                ) //y
+            }
+            .collect(Collectors.toList())
     }
 
     private fun norm(spectrum: Table, xLow: Int, upper: Int): Double {
@@ -132,7 +136,6 @@ object Threshold {
     }
 
 
-
     /**
      * Exponential function $a e^{\frac{x}{\sigma}}$
      */
@@ -149,10 +152,10 @@ object Threshold {
         val norm = norm(spectrum, xLow, upper)
 
         return ValueMap.ofPairs(
-                "U" to voltage,
-                "a" to a,
-                "sigma" to sigma,
-                "correction" to a * sigma * Math.exp(xLow / sigma) / norm + 1.0
+            "U" to voltage,
+            "a" to a,
+            "sigma" to sigma,
+            "correction" to a * sigma * Math.exp(xLow / sigma) / norm + 1.0
         )
     }
 
@@ -173,14 +176,14 @@ object Threshold {
             val delta = shift ?: parameters[2]
             return if (parameters.size > 2) {
                 doubleArrayOf(
-                        Math.pow(x - delta, beta),
-                        a * Math.pow(x - delta, beta) * Math.log(x - delta),
-                        -a * beta * Math.pow(x - delta, beta - 1)
+                    Math.pow(x - delta, beta),
+                    a * Math.pow(x - delta, beta) * Math.log(x - delta),
+                    -a * beta * Math.pow(x - delta, beta - 1)
                 )
             } else {
                 doubleArrayOf(
-                        Math.pow(x - delta, beta),
-                        a * Math.pow(x - delta, beta) * Math.log(x - delta)
+                    Math.pow(x - delta, beta),
+                    a * Math.pow(x - delta, beta) * Math.log(x - delta)
                 )
             }
         }
@@ -206,11 +209,11 @@ object Threshold {
         val norm = norm(spectrum, xLow, upper)
 
         return ValueMap.ofPairs(
-                "U" to voltage,
-                "a" to a,
-                "beta" to beta,
-                "delta" to delta,
-                "correction" to a / (beta + 1) * Math.pow(xLow - delta, beta + 1.0) / norm + 1.0
+            "U" to voltage,
+            "a" to a,
+            "beta" to beta,
+            "delta" to delta,
+            "correction" to a / (beta + 1) * Math.pow(xLow - delta, beta + 1.0) / norm + 1.0
         )
     }
 
@@ -223,23 +226,33 @@ object Threshold {
     }
 
     fun calculateSubThreshold(set: NumassSet, config: Meta, analyzer: NumassAnalyzer = SmartAnalyzer()): Table {
-        val reference = config.optNumber("reference").nullable?.let{
+        val reference = config.optNumber("reference").nullable?.let {
             set.getPoints(it.toDouble()).firstOrNull() ?: error("Reference point not found")
         }?.let {
             println("Using reference point ${it.voltage}")
-            analyzer.getAmplitudeSpectrum(it,config)
+            analyzer.getAmplitudeSpectrum(it, config)
         }
 
         return ListTable.Builder().apply {
-            set.forEach{ point ->
-                val spectrum = analyzer.getAmplitudeSpectrum(point,config).let {
-                    if(reference == null){
+            StreamSupport.stream(set.spliterator(), true).map { point ->
+                LoggerFactory.getLogger(Threshold.javaClass).info("Starting point ${point.voltage}")
+                val spectrum = analyzer.getAmplitudeSpectrum(point, config).let {
+                    if (reference == null) {
                         it
-                    } else{
-                        subtractAmplitudeSpectrum(it,reference)
+                    } else {
+                        subtractAmplitudeSpectrum(it, reference)
                     }
                 }
-                row(calculateSubThreshold(spectrum,point.voltage,config))
+                LoggerFactory.getLogger(Threshold.javaClass).info("Calculating threshold ${point.voltage}")
+                try {
+                    calculateSubThreshold(spectrum, point.voltage, config)
+                } catch (ex: Exception) {
+                    LoggerFactory.getLogger(Threshold.javaClass).error("Failed to fit point ${point.voltage}", ex)
+                    null
+                }
+            }.toList().filterNotNull().forEach {
+                println(it.toString())
+                row(it)
             }
         }.build()
     }
diff --git a/numass-main/src/main/kotlin/inr/numass/tasks/NumassTasks.kt b/numass-main/src/main/kotlin/inr/numass/tasks/NumassTasks.kt
index d2889193..96676ba9 100644
--- a/numass-main/src/main/kotlin/inr/numass/tasks/NumassTasks.kt
+++ b/numass-main/src/main/kotlin/inr/numass/tasks/NumassTasks.kt
@@ -4,8 +4,6 @@ import hep.dataforge.configure
 import hep.dataforge.data.*
 import hep.dataforge.io.output.stream
 import hep.dataforge.io.render
-import hep.dataforge.meta.Meta
-import hep.dataforge.meta.MetaUtils
 import hep.dataforge.meta.buildMeta
 import hep.dataforge.nullable
 import hep.dataforge.plots.data.DataPlot
@@ -86,11 +84,13 @@ val analyzeTask = task("analyze") {
         info = "Count the number of events for each voltage and produce a table with the results"
     }
     model { meta ->
-        dependsOn(selectTask, meta);
-        configure(MetaUtils.optEither(meta, "analyzer", "prepare").orElse(Meta.empty()))
+        dependsOn(selectTask, meta)
+        configure {
+            "analyzer" to meta.getMetaOrEmpty("analyzer")
+        }
     }
     pipe<NumassSet, Table> { set ->
-        SmartAnalyzer().analyzeSet(set, meta).also { res ->
+        SmartAnalyzer().analyzeSet(set, meta.getMeta("analyzer")).also { res ->
             val outputMeta = meta.builder.putNode("data", set.meta)
             context.output.render(res, stage = "numass.analyze", name = name, meta = outputMeta)
         }
@@ -299,7 +299,7 @@ val histogramTask = task("histogram") {
         value(
             "binning",
             types = listOf(ValueType.NUMBER),
-            defaultValue = 20,
+            defaultValue = 16,
             info = "The binning of resulting histogram"
         )
         value(
@@ -381,7 +381,7 @@ val histogramTask = task("histogram") {
             data.toSortedMap().forEach { name, set ->
                 putNode("data", buildMeta {
                     "name" to name
-                    set.meta.useMeta("iteration_info"){"iteration" to it}
+                    set.meta.useMeta("iteration_info") { "iteration" to it }
                 })
             }
         }
diff --git a/numass-main/src/main/kotlin/inr/numass/tasks/SpecialNumassTasks.kt b/numass-main/src/main/kotlin/inr/numass/tasks/SpecialNumassTasks.kt
new file mode 100644
index 00000000..27b0d231
--- /dev/null
+++ b/numass-main/src/main/kotlin/inr/numass/tasks/SpecialNumassTasks.kt
@@ -0,0 +1,55 @@
+package inr.numass.tasks
+
+import hep.dataforge.io.render
+import hep.dataforge.plots.data.DataPlot
+import hep.dataforge.plots.output.plotFrame
+import hep.dataforge.plots.plotData
+import hep.dataforge.tables.Adapters
+import hep.dataforge.tables.Table
+import hep.dataforge.tables.filter
+import hep.dataforge.useMeta
+import hep.dataforge.values.ValueType
+import hep.dataforge.workspace.tasks.task
+import inr.numass.data.NumassDataUtils
+import inr.numass.data.api.NumassSet
+import inr.numass.subthreshold.Threshold
+
+val subThresholdTask = task("threshold") {
+    descriptor {
+        value("plot", types = listOf(ValueType.BOOLEAN), defaultValue = false, info = "Show threshold correction plot")
+        value(
+            "binning",
+            types = listOf(ValueType.NUMBER),
+            defaultValue = 16,
+            info = "The binning used for fit"
+        )
+        info = "Calculate sub threshold correction"
+    }
+    model { meta ->
+        dependsOn(selectTask, meta)
+        configure(meta.getMetaOrEmpty("threshold"))
+        configure {
+            meta.useMeta("analyzer") { putNode(it) }
+            setValue("@target", meta.getString("@target", meta.name))
+        }
+    }
+    join<NumassSet, Table> { data ->
+        val sum = NumassDataUtils.join(name, data.values)
+
+        val correctionTable = Threshold.calculateSubThreshold(sum, meta).filter {
+            it.getDouble("correction") in (1.0..1.2)
+        }
+
+        if (meta.getBoolean("plot", false)) {
+            context.plotFrame("$name.plot", stage = "numass.threshold") {
+                plots.setType<DataPlot>()
+                plotData("${name}_cor", correctionTable, Adapters.buildXYAdapter("U", "correction"))
+                plotData("${name}_a", correctionTable, Adapters.buildXYAdapter("U", "a"))
+                plotData("${name}_beta", correctionTable, Adapters.buildXYAdapter("U", "beta"))
+            }
+        }
+
+        context.output.render(correctionTable, "numass.correction", name, meta = meta)
+        return@join correctionTable
+    }
+}
diff --git a/settings.gradle b/settings.gradle
index bbd2f6a1..2096fbcd 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -15,6 +15,7 @@ include ":numass-core"
 
 include 'numass-core:numass-data-api'
 include 'numass-core:numass-data-proto'
+include 'numass-core:numass-signal-processing'
 
 //include ":numass-server"
 //