diff --git a/build.gradle b/build.gradle
index 076e1a70..c8728c37 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,9 +1,9 @@
 buildscript {
-    ext.kotlin_version = "1.2.31"
+    ext.kotlin_version = "1.2.40"
     repositories {
         jcenter()
         maven {
-            url  "https://dl.bintray.com/kotlin/kotlin-eap"
+            url = "https://dl.bintray.com/kotlin/kotlin-eap"
         }
     }
 
@@ -12,7 +12,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
-allprojects{
+allprojects {
     apply plugin: 'idea'
     apply plugin: 'java'
     apply plugin: "kotlin"
@@ -25,12 +25,12 @@ allprojects{
     repositories {
         jcenter()
         mavenCentral()
-        //maven { url "https://jitpack.io" }
-        maven { url  "http://dl.bintray.com/kotlin/ktor" }
-        maven { url "https://dl.bintray.com/kotlin/kotlinx" }
+        maven { url = "https://jitpack.io" }
+        maven { url = "http://dl.bintray.com/kotlin/ktor" }
+        maven { url = "https://dl.bintray.com/kotlin/kotlinx" }
     }
 
-    dependencies{
+    dependencies {
         compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
         compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
         testCompile group: 'junit', name: 'junit', version: '4.+'
@@ -45,7 +45,7 @@ allprojects{
         }
     }
 
-    compileTestKotlin{
+    compileTestKotlin {
         kotlinOptions {
             jvmTarget = "1.8"
             javaParameters = true
diff --git a/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteClient.kt b/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteClient.kt
index 22fc89fd..998d6fc3 100644
--- a/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteClient.kt
+++ b/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteClient.kt
@@ -102,7 +102,7 @@ class DanteClient(val ip: String, chainLength: Int) : AutoCloseable {
      */
     private data class BoardState(val num: Int, var meta: Meta? = null)
 
-    private val boards = (0..chainLength).map { BoardState(it) }
+    private val boards = (0  until chainLength).map { BoardState(it) }
 
 
     fun open() {
diff --git a/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteTest.kt b/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteTest.kt
index 32507db5..bb5592ca 100644
--- a/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteTest.kt
+++ b/numass-control/dante/src/main/kotlin/inr/numass/control/dante/DanteTest.kt
@@ -33,7 +33,7 @@ import inr.numass.data.channel
 import kotlinx.coroutines.experimental.runBlocking
 
 fun main(args: Array<String>) {
-    val client = DanteClient("192.168.111.120", 7)
+    val client = DanteClient("192.168.111.120", 8)
     client.open()
     val meta = buildMeta {
         "gain" to 1.0
diff --git a/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt b/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
index 06a461b5..5d5ec0e4 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
@@ -1,7 +1,6 @@
 package inr.numass.data
 
 import hep.dataforge.io.envelopes.Envelope
-import hep.dataforge.kodex.nullable
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import inr.numass.data.api.*
@@ -63,16 +62,16 @@ val Envelope.dataStream: InputStream
         this.data.stream
     }
 
-val NumassBlock.channel: Int?
+val NumassBlock.channel: Int
     get() = if (this is ProtoBlock) {
         this.channel
     } else {
-        this.meta.optValue("channel").map { it.getInt() }.nullable
+        0
     }
 
 
 fun NumassBlock.transformChain(transform: (NumassEvent, NumassEvent) -> Pair<Short, Long>?): NumassBlock {
-    return SimpleBlock(this.startTime, this.length, this.meta) { owner ->
+    return SimpleBlock(this.startTime, this.length) { owner ->
         this.events.asSequence()
                 .sortedBy { it.timeOffset }
                 .zipWithNext(transform)
@@ -82,7 +81,7 @@ fun NumassBlock.transformChain(transform: (NumassEvent, NumassEvent) -> Pair<Sho
 }
 
 fun NumassBlock.filterChain(condition: (NumassEvent, NumassEvent) -> Boolean): NumassBlock {
-    return SimpleBlock(this.startTime, this.length, this.meta) { owner ->
+    return SimpleBlock(this.startTime, this.length) { owner ->
         this.events.asSequence()
                 .sortedBy { it.timeOffset }
                 .zipWithNext().filter { condition.invoke(it.first, it.second) }.map { it.second }.asIterable()
@@ -90,13 +89,13 @@ fun NumassBlock.filterChain(condition: (NumassEvent, NumassEvent) -> Boolean): N
 }
 
 fun NumassBlock.filter(condition: (NumassEvent) -> Boolean): NumassBlock {
-    return SimpleBlock(this.startTime, this.length, this.meta) { owner ->
+    return SimpleBlock(this.startTime, this.length) { owner ->
         this.events.asSequence().filter(condition).asIterable()
     }
 }
 
 fun NumassBlock.transform(transform: (NumassEvent) -> OrphanNumassEvent): NumassBlock {
-    return SimpleBlock(this.startTime, this.length, this.meta) { owner ->
+    return SimpleBlock(this.startTime, this.length) { owner ->
         this.events.asSequence()
                 .map { transform(it).adopt(owner) }
                 .asIterable()
diff --git a/numass-core/src/main/kotlin/inr/numass/data/api/MetaBlock.kt b/numass-core/src/main/kotlin/inr/numass/data/api/MetaBlock.kt
index fba2bd5a..36142bc5 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/api/MetaBlock.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/api/MetaBlock.kt
@@ -1,6 +1,5 @@
 package inr.numass.data.api
 
-import hep.dataforge.meta.Meta
 import java.time.Duration
 import java.time.Instant
 import java.util.*
@@ -10,7 +9,7 @@ import java.util.stream.Stream
  * A block constructed from a set of other blocks. Internal blocks are not necessary subsequent. Blocks are automatically sorted.
  * Created by darksnake on 16.07.2017.
  */
-class MetaBlock(blocks: Collection<NumassBlock>, override val meta: Meta = Meta.empty()) : NumassBlock {
+class MetaBlock(blocks: Collection<NumassBlock>) : NumassBlock {
 
     private val blocks = TreeSet(Comparator.comparing<NumassBlock, Instant>{ it.startTime })
 
diff --git a/numass-core/src/main/kotlin/inr/numass/data/api/NumassBlock.kt b/numass-core/src/main/kotlin/inr/numass/data/api/NumassBlock.kt
index 876bdda4..0cb5ea79 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/api/NumassBlock.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/api/NumassBlock.kt
@@ -1,7 +1,5 @@
 package inr.numass.data.api
 
-import hep.dataforge.meta.Meta
-import hep.dataforge.meta.Metoid
 import inr.numass.data.channel
 import kotlinx.coroutines.experimental.runBlocking
 import java.io.Serializable
@@ -21,7 +19,7 @@ import java.util.stream.Stream
  */
 class NumassEvent(val amp: Short, val timeOffset: Long, val owner: NumassBlock) : Serializable {
 
-    val channel: Int?
+    val channel: Int
         get() = owner.channel
 
     val time: Instant
@@ -36,7 +34,7 @@ class NumassEvent(val amp: Short, val timeOffset: Long, val owner: NumassBlock)
  *
  * Created by darksnake on 06-Jul-17.
  */
-interface NumassBlock : Metoid {
+interface NumassBlock {
 
     /**
      * The absolute start time of the block
@@ -80,7 +78,6 @@ val OrphanNumassEvent.amp: Short
 class SimpleBlock(
         override val startTime: Instant,
         override val length: Duration,
-        override val meta: Meta = Meta.empty(),
         producer: suspend (NumassBlock) -> Iterable<NumassEvent>) : NumassBlock, Serializable {
 
     private val eventList = runBlocking { producer(this@SimpleBlock).toList()}
diff --git a/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt b/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
index ca9260c1..b8e9e862 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
@@ -2,6 +2,7 @@ package inr.numass.data.api
 
 import hep.dataforge.io.envelopes.Envelope
 import hep.dataforge.meta.Metoid
+import inr.numass.data.channel
 import inr.numass.data.storage.ClassicNumassPoint
 import inr.numass.data.storage.ProtoNumassPoint
 import java.time.Duration
@@ -45,7 +46,7 @@ interface NumassPoint : Metoid, NumassBlock {
      * @return
      */
     override val startTime: Instant
-        get() = meta.optValue(START_TIME_KEY).map<Instant> { it.getTime() }.orElseGet { firstBlock.startTime }
+        get() = meta.optValue(START_TIME_KEY).map<Instant> { it.time }.orElseGet { firstBlock.startTime }
 
     /**
      * Get the length key of meta or calculate length as a sum of block lengths. The latter could be a bit slow
@@ -53,10 +54,7 @@ interface NumassPoint : Metoid, NumassBlock {
      * @return
      */
     override val length: Duration
-        get() = Duration.ofNanos(
-                meta.optValue(LENGTH_KEY).map<Long> { it.getLong() }
-                        .orElseGet { blocks.mapToLong { it -> it.length.toNanos() }.sum() }
-        )
+        get() =  Duration.ofNanos(blocks.filter{it.channel == 0}.mapToLong { it -> it.length.toNanos() }.sum())
 
     /**
      * Get all events it all blocks as a single sequence
diff --git a/numass-core/src/main/kotlin/inr/numass/data/storage/ClassicNumassPoint.kt b/numass-core/src/main/kotlin/inr/numass/data/storage/ClassicNumassPoint.kt
index 64176af4..974bdc6a 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/storage/ClassicNumassPoint.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/storage/ClassicNumassPoint.kt
@@ -49,8 +49,7 @@ class ClassicNumassPoint(private val envelope: Envelope) : NumassPoint {
     //TODO split blocks using meta
     private inner class ClassicBlock(
             override val startTime: Instant,
-            override val length: Duration,
-            override val meta: Meta = Meta.empty()) : NumassBlock, Iterable<NumassEvent> {
+            override val length: Duration) : NumassBlock, Iterable<NumassEvent> {
 
         override val events: Stream<NumassEvent>
             get() = StreamSupport.stream(this.spliterator(), false)
diff --git a/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt b/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
index ce14f825..f8ab6baa 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
@@ -3,9 +3,7 @@ package inr.numass.data.storage
 import hep.dataforge.context.Context
 import hep.dataforge.context.Global
 import hep.dataforge.io.envelopes.Envelope
-import hep.dataforge.kodex.buildMeta
 import hep.dataforge.kodex.toList
-import hep.dataforge.meta.Laminate
 import hep.dataforge.meta.Meta
 import inr.numass.data.NumassProto
 import inr.numass.data.api.NumassBlock
@@ -26,7 +24,9 @@ import java.util.stream.Stream
  * Protobuf based numass point
  * Created by darksnake on 09.07.2017.
  */
-class ProtoNumassPoint(val proto: NumassProto.Point, override val meta: Meta) : NumassPoint {
+class ProtoNumassPoint(override val meta: Meta, protoBuilder: () -> NumassProto.Point) : NumassPoint {
+
+    val proto: NumassProto.Point by lazy(protoBuilder)
 
     override val blocks: Stream<NumassBlock>
         get() = proto.channelsList.stream()
@@ -47,16 +47,25 @@ class ProtoNumassPoint(val proto: NumassProto.Point, override val meta: Meta) :
             super.startTime
         }
 
+    override val length: Duration
+        get() = if (meta.hasValue("acquisition_time")) {
+            Duration.ofMillis((meta.getDouble("acquisition_time") * 1000).toLong())
+        } else {
+            super.length
+        }
+
+
     companion object {
         fun readFile(path: Path): ProtoNumassPoint {
             return fromEnvelope(NumassFileEnvelope.open(path, true))
         }
 
         fun fromEnvelope(envelope: Envelope): ProtoNumassPoint {
-            val proto = envelope.dataStream.use {
-                NumassProto.Point.parseFrom(it)
+            return ProtoNumassPoint(envelope.meta){
+                envelope.dataStream.use {
+                    NumassProto.Point.parseFrom(it)
+                }
             }
-            return ProtoNumassPoint(proto, envelope.meta)
         }
 
         fun readFile(path: String, context: Context = Global): ProtoNumassPoint {
@@ -71,20 +80,15 @@ class ProtoNumassPoint(val proto: NumassProto.Point, override val meta: Meta) :
     }
 }
 
-class ProtoBlock(val channel: Int, private val block: NumassProto.Point.Channel.Block, parent: NumassBlock? = null) : NumassBlock {
-    override val meta: Meta by lazy {
-        val blockMeta = buildMeta {
-            "channel" to channel
-        }
-        return@lazy parent?.let { Laminate(blockMeta, parent.meta) } ?: blockMeta
-    }
+class ProtoBlock(val channel: Int, private val block: NumassProto.Point.Channel.Block, val parent: NumassPoint? = null) : NumassBlock {
 
     override val startTime: Instant
         get() = ProtoNumassPoint.ofEpochNanos(block.time)
 
     override val length: Duration = when {
         block.length > 0 -> Duration.ofNanos(block.length)
-        meta.hasValue("acquisition_time") -> Duration.ofMillis((meta.getDouble("acquisition_time") * 1000).toLong())
+        parent?.meta?.hasValue("acquisition_time") ?: false ->
+            Duration.ofMillis((parent!!.meta.getDouble("acquisition_time") * 1000).toLong())
         else -> {
             LoggerFactory.getLogger(javaClass).error("No length information on block. Trying to infer from first and last events")
             val times = events.map { it.timeOffset }.toList()
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
index 65ae050a..55807750 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
@@ -87,6 +87,17 @@ class StorageView(private val context: Context = Global) : View(title = "Numass
             }
         }
 
+        val children: List<Container>? by lazy {
+            when (content) {
+                is Storage -> (content.shelves().sorted() + content.loaders().sorted()).map { buildContainer(it, this) }
+                is NumassSet -> content.points.map { buildContainer(it, this) }.toList().sortedBy { it.id }
+                else -> null
+            }
+        }
+
+        val hasChildren: Boolean
+            get() = (content is Storage) || (content is NumassPoint)
+
     }
 
     override val root = borderpane {
@@ -153,6 +164,15 @@ class StorageView(private val context: Context = Global) : View(title = "Numass
                                 }
                                 runLater { statusBar.progress = 0.0 }
                             }
+
+                            /*
+                                                        lazyPopulate( leafCheck = { it.value.hasChildren }) {
+                                runLater { statusBar.progress = -1.0 }
+                                it.value.children.also {
+                                    runLater { statusBar.progress = 0.0 }
+                                }
+                            }
+                             */
                         }
                     }
                     cellFormat { value ->