Inspired by Buchla Spectral Processor

During some private coaching I was asked if it is possible to build something like the Buchla Spectral Processor in Kyma. Certainly the answer is yes Or as Pete once said to me: “Of course this is possible in Kyma, I just don’t know how it’s done yet.”

Anyway, we just started to build it and of course we ended up with something different than the original. I’m not going to do a tutorial on how that Sound was made, I just want to explain the basic operation and of course share the Sound. So let’s have a look at the VCS and I’ll walk you through:

BuchlaInspired_VCS

The Sound has two mono inputs, namely A and B. Each input has got its own embedded VCS. On the A-side you set two 16-band filters (A and B ) and you can morph between them using the Morph Fader. Also using the SingleA and/or B toggle you can isolate a single Band and sweep through the filters using BandA and/or B. Finally there are two faders for Bandwidth (BW) and Level. The potentiometers and the Freeze toggle affect the B-side:

The first 16-band filter is set manually (A) while the second set of filters (T) is the envelope followed output of the A-side. Therefore you need the potentiometers: Attack and Release affect the followed envelope using the new BiDiFollower class. Also there is a control for PreEmphasis in dB which is basically a high shelving filter. Frequency sets the frequency where the boost starts. The PreEmphasis will only affect the followed envelopes, not the output of A. The Freeze button sampleAndHolds the current envelope values and can be used to extract a static filter setting from the A input.

So the B-Side is kind of a Vocoder but the funky thing about it is you can morph between different filter settings on the A-side and therefore morph between different filter settings for the analysis/envelope followers.

Just for the fun of it I’ve added another version where the Morph faders get modulated by a LFO. But there are lots of other modulation possibilities here and also we haven’t even used the AnalogSequencer yet Let me know if you come up with something, feel free to share it on the Kyma Community Sound Library as well.

 

Enjoy!

 

Download Sound

Kyma Community Library

 

5 replies
  1. bphenix
    bphenix says:

    Nice! This looks better than the version I created a few years back. I like the envelope follower concept on the B channel.

    Reply
    • kymaguy
      kymaguy says:

      Thanks!
      You could share your Sound in the Community Library as well, I’d like to hear!

      Reply
      • bphenix
        bphenix says:

        I have a backlog of files to clean up for Kyma7 and upload them to the new library. The sound example is on the forum and there is a vimeo here: https://vimeo.com/17666228

        Like you, the base concept led to a different overall implementation / take on the idea.

        Reply
        • kymaguy
          kymaguy says:

          Looks/Sounds great!
          Of course, sticking with the original plan is almost impossible in Kyma Basically my version lacks the LFOs for the bands and the odd/even inputs/outputs. Your version lacks the envelope followers it seems. So if we combine our versions we should end up with the original on steroids

          Reply
          • bphenix
            bphenix says:

            I like the problem solving of building these inspired sounds. I have a Complex OSC (261e) inspired sound pretty much done outside of some tweaks I want to make. Of course, I add some enhancements and tweaks and now it is pretty much a different beast.

Trackbacks & Pingbacks

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply