Multi-channel volume and pan control

Christoph Hart

If you don't need RR repetition, you can use the RR groups as dynamic layers and fade between them using the crossfade tables for each group.

I implemented it for a cello library with 6 dynamic layers and it worked pretty good.

d.healey

Aha cool I see now

d.healey

Is there a default CC used by the group Xfade table? or can one be assigned?

Christoph Hart

The group xfade can be controlled with any modulator (it's a dedicated chain). You can even use envelopes for this...

If you want CC control, just drop a Midi Controller modulator there.

d.healey

Ah yes that makes sense.

How do you set more than one group to active at the same time? I'm sure I've done this before but now I can't seem to figure it out.

d.healey

I've set the groups to use XFade, I've added a modulator, I've called Synth.enableRoundRobin(false) but only on of the groups play back so the crossfade doesn't really do much. I tried using setActiveGroup() in a loop but still only one group is enabled. What am I missing?

Christoph Hart

This should work:

<?xml version="1.0" encoding="UTF-8"?>

<Processor Type="StreamingSampler" ID="Sampler" Bypassed="0" Gain="1" Balance="0"
           VoiceLimit="128" KillFadeTime="20" IconColour="0" PreloadSize="8192"
           BufferSize="4096" VoiceAmount="128" SamplerRepeatMode="0" RRGroupAmount="3"
           PitchTracking="1" OneShot="0" CrossfadeGroups="1" Purged="0"
           NumChannels="1" Group0Table="36..........9C...vOKfJ.+.........vO...f+.........vO"
           Group1Table="36...............vOKfJ.+....9C...vO...f+.........vO"
           Group2Table="36...............vOKfJ.+.........vO...f+....9C...vO"
           Group3Table="24...............vO...f+....9C...vO" Group4Table="24...............vO...f+....9C...vO"
           Group5Table="24...............vO...f+....9C...vO" Group6Table="24...............vO...f+....9C...vO"
           Group7Table="24...............vO...f+....9C...vO" SampleMap="">
  <EditorStates BodyShown="1" Visible="1" Solo="0" MapPanelShown="1" BigSampleMap="1"
                GainModulationShown="1" CrossfadeTableShown="0" SettingsShown="1"
                WaveformShown="1"/>
  <ChildProcessors>
    <Processor Type="MidiProcessorChain" ID="Midi Processor" Bypassed="0">
      <EditorStates BodyShown="1" Visible="0" Solo="0" Folded="1"/>
      <ChildProcessors/>
    </Processor>
    <Processor Type="ModulatorChain" ID="GainModulation" Bypassed="0" Intensity="1">
      <EditorStates BodyShown="1" Visible="0" Solo="0"/>
      <ChildProcessors>
        <Processor Type="SimpleEnvelope" ID="DefaultEnvelope" Bypassed="0" Intensity="1"
                   Attack="5" Release="10" LinearMode="1">
          <EditorStates BodyShown="1" Visible="1" Solo="0"/>
          <ChildProcessors>
            <Processor Type="ModulatorChain" ID="Attack Time Modulation" Bypassed="0"
                       Intensity="1">
              <EditorStates BodyShown="1" Visible="0" Solo="0" Folded="1"/>
              <ChildProcessors/>
            </Processor>
          </ChildProcessors>
        </Processor>
      </ChildProcessors>
    </Processor>
    <Processor Type="ModulatorChain" ID="PitchModulation" Bypassed="0" Intensity="0">
      <EditorStates BodyShown="1" Visible="0" Solo="0" Folded="1"/>
      <ChildProcessors/>
    </Processor>
    <Processor Type="EffectChain" ID="FX" Bypassed="0">
      <EditorStates BodyShown="1" Visible="0" Solo="0" Folded="1"/>
      <ChildProcessors/>
    </Processor>
    <Processor Type="ModulatorChain" ID="Sample Start" Bypassed="0" Intensity="1">
      <EditorStates BodyShown="1" Visible="0" Solo="0" Folded="1"/>
      <ChildProcessors/>
    </Processor>
    <Processor Type="ModulatorChain" ID="Group Fade" Bypassed="0" Intensity="1">
      <EditorStates BodyShown="1" Visible="1" Solo="0" Folded="0"/>
      <ChildProcessors>
        <Processor Type="MidiController" ID="Midi Controller" Bypassed="0" Intensity="1"
                   UseTable="0" Inverted="0" ControllerNumber="1" SmoothTime="200"
                   DefaultValue="0">
          <EditorStates BodyShown="1" Visible="1" Solo="0"/>
          <ChildProcessors/>
        </Processor>
      </ChildProcessors>
    </Processor>
  </ChildProcessors>
  <RoutingMatrix NumSourceChannels="2" Channel0="0" Send0="-1" Channel1="1" Send1="-1"/>
  <channels>
    <channelData enabled="1" level="0" suffix=""/>
  </channels>
  <samplemap ID="" SaveMode="0" RRGroupAmount="3" MicPositions=";"/>
</Processor>

You don't have to call Synth.enableRoundRobin(). Just set the RR Group Amount to your dynamic layer amount and set Group XF to enabled. This automatically deactivates the round robin behaviour and plays back all groups simlultaneuosly). You can then setup the crossfade curves for up to 8 layers by setting the table values for each group (you can choose different layer tables with the Edit XF drop down in the sampler settings.

The example uses three dynamic layers (take a look at the tables 1 - 3).

You can now use any modulator to morph between the dynamic layers (even polyphonic ones). The modulation output 0...1 will be the input for each table.

I might make this easier though - and I don't know why I chose this ugly colour for the modulator chain :)

d.healey

Thanks Christoph I'll give it a whirl

d.healey

I tried dropping samples into the sampler you've set up but even though I have samples mapped to the same keys in all three groups it's only playing one voice from group 1.

d.healey

Just wanted to give this a little bump. I've still not managed to get more than one sample triggered with the built in x-fade behavior.

Christoph Hart

This is an example project which uses a LFO to morph between two sustained samples (in this case, just a sine wave and a triangle).

Crossfade Test Project

Beware what you post next, it will be the 1000th post :)

d.healey

Thanks, I made a new build from github to try your example and it worked perfectly so then I retried my own project and it worked, so I'm thinking I just needed to update my build :)

Christoph Hart

Weird, I haven't touched that code since ages.

d.healey

Strange, maybe I derped somewhere else then :p

d.healey

Ok there is definitely an issue with this. I think I might have found the trigger for it. If there is already a sampler in the instrument and then you add another and try and setup the group xfades on the new sampler it won't work. If you only have one sampler though, or the group xfade sampler was the first sampler you added then it works. It also works if you duplicate a sampler that has the xfades already set up.

Christoph Hart

You were right. Although the problem was a more generic one: If you activate the KillNote retrigger behavior, it kills also samples that are just started and leaves only the last sample in the crossfade list alive. My example (and every time I used this feature) magically had the KillNote property disabled so I didn't notice it.

This is of course highly counterintuitive so I added a check that doesn't fire the retrigger behaviour if the voice was started with the same event. It's on GitHub now.

This also fixes the velocity X-Fade behavior and actually all cases where one event starts multiple samples (excluding multimic samples) so nice catch!

But it has nothing to do with another sampler and it would highly violate our precious encapsulation principle, so please make sure this problem does not persist.

d.healey

Excellent, glad it wasn't just me being mad

Multi-channel volume and pan control

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