Buchla Easel V - General Questions


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Do you have questions about the Buchla Easel V? You will likely find an answer here.

If you are a bit lost when designing your first patches, here are potential situations where you could be stuck with no sound output:


  • No source plugged in the low pass gate input + the level Fader at 0

no sound low pass gate no input mod fader 0


  •  A voltage source is plugged in the low pass gate input but modulation amount fader is at 0 + the level Fader at 0

no sound cable in mod 0 and level 0


  •  Chan A and Chan B at 0

no sound chan a 0 chan b 0


  •  Sequencer ON (Right Hand) with no note actives.

no sound sequencer right hand on without notes enabled

The Chan A and Chan B phases are inverted, meaning that when the Chan B source is set to Gate A, it results in duplicating the Chan A signal and reverse it's polarity.

In this situation, when both channels are opened, it will result in a partial phase cancelation of the sound output.
(The phase is not perfectly reversed so at equal volume, the sound won't be totally cancelled and can eventually create cool effects.)

no sound a and b output inverted

On some patches, once you press a note, the sound may start but never end.
This is normal, and can happens in several situations like when:
  • The Low-pass/Gate Level is raised = VCA opened.
  • The pulser or sequencer controls the Low pass gate and are not dependant of the keyboard trigger.
  • The Right Hand Sequencer is on run.
If you need some silence, the Low pass gate closes until your press a note again when:
  • You change the preset.
  • Click on the Panic button.
  • A Stop message is received.
However, it will reopen as soon as a note is played.
This is normal, the consumption is related to some aspects of the emulation, which are the following:

  • Accuracy of the emulation: We meticulously recreated the rare 1973 Buchla Music Easel right down to the component level. This led to get the sound as close as possible from the original instrument. However, this consequently requires some CPU processing.

  • Constant processing: The Buchla Easel V works in a very different way rather than other synths emulations we've made. The synth audio engine doesn't start when a note is pressed. It is always alive.

  • Bring polyphony to a monophonic monument: The Music Easel is a monophonic monster built with a very complex circuitry. 
    However, we wanted to push further the limits of this instruments, and transformed it into a polyphonic supersynth.
    We made it ! But this has a huge CPU cost that not everybody will be able to afford.

You can drastically reduce the CPU consumption of the Buchla Easel V by simply limiting it's maximum polyphony voices from the bottom toolbar.

cpu buchla max poly voice

If you have any further questions, feel free to contact us.