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StreamByter Script: Distribute polyphonic midi to N channels with M voices each

_ki_ki
edited December 2018 in App Tips and Tricks

The „Poly To NxM“ StreamByter script (script source at the Audeanic forum is a followup/enhanced version of the Poly To N Mono script.

The script can be used to

  • Play multiple instances of monophonic synth (using the same preset) as if it was a polyphonic synth
  • Enhance the polyphony of limited-polyphony synths

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There are two user-specified variables at the top of the well documented script, one for defining the number of output synth instances (channels) and a second to specify the base polyphony (#voices) of each instance. After changing these values, press ‚Install Rules‘ reinitialize the script.

Feeding the script with polyphonic midi input will then distribute the concurrent notes to the available channels/voices. If more notes than the available (channels * #voices) are needed, ‚voice stealing‘ will happen by ‚hiding’ the ‚oldest’ notes and replacing them with the new ones. If later some notes are released and voices become available, the ‚hidden‘ notes are revealed again with their original velocity. Other midi events like pitch-bend and aftertouch are also distributed to the channels.

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In the Audiobus presets:

'Poly To NxM - 5x1 BassAlicious': http://preset.audiob.us/VXtE1M8NgXC5JXa
'Poly To NxM - 2x4 Model D': http://preset.audiob.us/Bb5HtdPOTzQPWTW

select the StreamByter instrument plugin and play its Audiobus keyboard in polyphony.

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Alternatively you can try two AM sessions

‚Poly To NxM - 6x1 Troublemaker‘
‚Poly To NxM - 2x4 Model D‘

Just follow the links, download them and use „open in AUM“, open AUMs keyboard and play in polyphony.

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In all of these projects/session the keyboard feeds polyphonic midi into the SteamByter script and several instances of the output plugins read midi from this script - but only uses a single channel. In AUm this is done by AUMs channel filter, in AudioBus by using an additional StreamByter effect plugin with filter script in each midi line.

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IOS Synth candidates (less than 8 voices polyphony):

  • 1 voice (mono): Ripplemaker, Troublemaker, BassAlicious, Cyclop, iVCS, Viking
  • 4 voices: Model D, Model 15, EGSS01
  • 6 voices: Quanta

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