I thought I'd follow up my last post with a list of the variable parameters on the SY-2 and SY-1.
Since I've never seen or used an SY-1, nor seen the service manual, some of the explanations on the SY-1 are guesses based upon my knowledge of the SY-2 terminology. Yamaha used strange names for some of the parameters on their early synthesizers, as did Korg. However the actual synthesizer structure behind the strangely named controls is a lot more conventional than on the early Korgs.
If anyone has an SY-1, please could they check my guesses of the parameter functions.
SY-2
Pitch bend: on/off - an initial upward sweep in VCO pitch to the desired note
Portamento: on/off, short/long control
Tone Bend: preset/variable, attack time, intensity, decay time - these are three of the five Yamaha VCF envelope parameters, with intensity corresponding to attack level
Pulse Width: preset/variable, pulse width control
Vibrato: preset/variable, speed and depth controls - the vibrato LFO also controls VCF LFO modulation on the FUNNY and WAH GUITAR preset sounds
Envelope: preset/variable, attack time, decay time, sustain level, release time - VCA envelope
Filter: preset/variable, LPF cutoff, LPF resonance, HPF cutoff, HPF resonance
In addition to the above there are also controls for tuning, volume, aftertouch sensitivity and foot pedal sensitivity. Aftertouch may be routed to VCO LFO modulation and/or VCF and/or VCA modulation. Foot pedal may be routed to VCF and/or VCA modulation.
Waveform, VCF LFO modulation depth, pulse width modulation speed and depth, filter envelope initial level, release time and polarity are all determined by the choice of preset sound.
The octave selection system is a little strange. There are four footage controls but five actual footages available. On some preset sounds the four controls correspond to 16', 8', 4', 2' and on other preset sounds the controls correspond to 32', 16', 8', 4'.
SY-1
Attack bend pitch: on/off - I think this corresponds to Pitch bend on the SY-2
Attack bend tone: on/off, intensity, time - I think these are attack time and attack level of the Yamaha VCF envelope, initial level, decay time and release time are always preset
Portamento: on/off, short/long control
Pulse width: preset/variable, pulse width control
Vibrato: preset/variable, speed and depth controls - also VCF LFO modulation on certain preset sounds?
Envelope: preset/variable, attack and sustain controls - no decay or release controls
Filter: preset/variable, cutoff and resonance controls - at a guess these are controls for the LPF, with the HPF always preset
In addition to the above there are also controls for tuning, volume, aftertouch sensitivity and two foot pedal sensitivity controls. Aftertouch may be routed to VCO LFO modulation and/or VCF and/or VCA modulation. There are separate controls on the back of the machine for foot pedal VCF modulation and VCA modulation.
Other aspects seem to be as per the SY-2.
From: Richard Atkinson
Sent: Monday, November 03, 2008 11:39 PM
To:
yamahacs80@yahoogroups.com
Subject: Re: [yamahacs80] SY-1 service manual....?
The SY-2 has many more variable parameters than the SY-1. It's almost the complete GX-1 VCO LPF HPF VCA voice structure, with just a few things determined by the preset only.
The waveform (sawtooth or pulse), VCF modulation, PW modulation and octave (high or low) are determined by signals connected to the 14 voice switches. These could be replaced with simple on/off switches.
Of all the other parameters, only three are preset and not adjustable using the variable controls: filter envelope initial level and release (using CS-50/60/80 terminology) and filter envelope polarity. Controls for everything else are provided, with a system for bringing groups of them in or out of operation.
From: David Rogoff
Sent: Monday, November 03, 2008 7:47 PM
To:
yamahacs80@yahoogroups.com
Subject: Re: [yamahacs80] SY-1 service manual....?
FYI - just looked on eBay and found several CSY-1 service manuals for
sale!!!
http://shop.ebay.com/?_from=R40&_trksid=m38.l1313&_nkw=yamaha+csy*&_sacat=See-All-Categories
Also, can someone explain the differences between the SY1 and the SY2,
other than the case.
David
David Rogoff wrote:
> Tom,
>
> I have about half of it scanned. I need to get back to it. I'll try and
> put up what I have so far in the next few days.
>
> David
>
> Quazimodo wrote:
> > Hi David,
> >
> > I was wondering if the SY-1 service manual was up on your site yet
> > please. The link below only shows the front cover of the manual.
> >
> > I just picked up a CSY-1 organ and would maybe like to have a go at
> > "extracting" the synth section...
> >
> > Cheers,
> > Tom
> >
> >
> >
> >
> > --- In yamahacs80@yahoogroups.com, David Rogoff <david@...> wrote:
> > > >
> > > Close. Sort of the top keyboard of one:
> > > http://therogoffs.com/cs80/manuals/SY1_Service_Manual/00%20-%20cover.jpg
> > >
> > > By the way, the missing pages are now scanned and one the site.
> > >
> > > David
> >
> >
>
>
>
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