Yamaha CS01 New Hybrid Waveforms Modification

Inspired by some work by Plutonique9, I opened up my Yamaha CS01 analog monophonic mini-synth and discovered that you can make the tone generator chip generate (at least) 3 new hybrid waveforms.

There are some caveats:
-depending on the waveform you hybridize, the footage switch gets out of wack on one of the settings (but you still get 3 of the 4 footages working correctly and thus the full range of the keyboard).
- on that one wacked out footage setting, any glissando means a drone on one note and a walk-up/walk-down gliss

Category:

Music

Tags:

• yamaha
• synth
• cs01
• cs-01
• vco
• waveforms
• dco

[rga24yt]

Hi, I would guess you are generating the new waveforms by connecting more than one of N2, N3, N4 and N5 to the F signal, is this correct? I have done some modifications of my own to my CS01 and would like to add these extra waveforms to my machine, especially the final waveform!

[rolandsh1000]

@rga24yt

Pretty much that's it. If you email me, I can tell you what the various shortings are...or you can figure them out on your own - not too much testing involved.

What mods have you done to your CS01?

[rga24yt]

@rolandsh1000 Hi, I've just done the mods on my CS01. I used diodes between the signals on the board and the new switches, so that my circuit doesn't have the caveats you mention. You can get 4 useful new waveforms, plus 3 waveforms based on the pulse wave setting that sound pretty much like pulse itself, 7 new waveforms in all, at all footages.

[rolandsh1000]

@rga24yt

Excellent!!! I hadn't considered using the diodes so that's a terrific addition, makes these waveforms now equivalent to stock performance.

Love to see how you laid out the switches and the pots - to me that might be the most challenging part of all, given the very tight space in the CS01. Care to post a video, or send me pics? Better yet, send pics to Matrixsynth so he can post them and CS01 owners will be wanting to do these mods.

Again, great work!

[rolandsh1000]

@rolandsh1000

sounds great.

I hear you on the no-URL-in-Youtube, but can you type some keywords so I could google your blog?

[deeJayfirby]

See you have talent. You should consider building a synth from scratch. Just think about it. Put yourself into some risk to put yourself ahead.

[rolandsh1000]

Thanks for the compliment. I am much more a person who modifies things rather than creates them whole, so I'll leave creating a synth from scratch to others.

My most ambitious projects have been to take sections of dead or parted-out synths and to reconstruct them into different things. Perhaps I'll post my Sixtrak-DW6000 hybrid synthesizer sometime.

Thanks again!

[SHUJINCELL]

Sick.

[rga24yt]

@rolandsh1000 I wrote up the mods I did and published them as a blog post. Hopefully Matrixsynth will pick up on this; I can't post URLs in YouTube comments.

[rga24yt]

@rolandsh1000 OK, at a guess they are Triangle & Sawtooth together, Triangle & Square, Sawtooth & Square. Any that use PWM?

I'm about to write a blog post about my CS01:

10k pot for resonance added

3 position switch added for modulation wheel source - LFO (as standard), VCO or Noise, assignable to VCO or VCF

3 position switch added for breath control modulation source - as above, but available on the breath control VCF and VCA knobs

Old resonance switch now EG / Gate selector for VCA.