diy GM synth

[The Dark force of dance]

Y-ellow Y'all.
	Being your resident Yamaha FM expert, I have to point out that...

At 10:02 AM 03/25/99 +1000, Paul Perry wrote:
>At 10:18 AM 24/03/99 -0800, Nick Thompson wrote:
>
>>  I personally think that a DX-7 with analog filters would be
>>really interesting.
>>
>Well, this isn't hard if you are happy being monophonic,
>you use a midi-cv convertor and trigger simultaneously the DX7
>and the VCF of your choice.
>But, seperate outs for a DX7 aren't really possible as a mod,
>so you'll have to pick up an old TX816 rack (not impossible..
>even here in Australia people have got bargains here) and then
>put a stack of filters together.. 

A DX7 Mk1 offers only one possible output. Everything is muxed within the
OPS chip. However. A DX7 MK2 actually provides 16 separate outputs. The
fact that these are mixed (Analogue) into 2 outputs is simply due to the
The overall plan yamaha had for it. The same chip set is mixed (analogue)
to 8 separate outputs in the TX802 as standard. As well as the two stereo
outputs. My infamous "NOT OUTPUT" project for the 802 also provides a mono
FX send thru which any or all of the 8 channels can be routed. I use this
to send to a Yamaha SPX50D and they work as a team. (An SPX50D is an SPX90
designed for guitars so it has distortion and crud)

But should I have suitable success with this MIDI mixer I'm working on at
the moment, I fully plan to adapt it into a NOT-OUT MK II. Of which will
indeed have an Analogue filter. Type yet to be determined. But for those
wishing to add filters to FM you could take a look at any of the DX7 MK II
family.

Or of course you could simply acquire yourself a Yamaha TG/SY77. This has 6
operator FM, the ability to use PCM wave forms as any or all of the FM wave
forms, and each voice has 2 multi-mode filters. Quite nice filters they are
too. Very under-rated. You can set them up so that you have one high and
one low and get a multi-spread bandpass with 2 pole response. Or you can
set it up to provide a single lowpass with 4 pole response. Each filter has
it's own envelope generator and can be controlled by separate controllers
if desired. And the outputs have true-pan. Not just switched
left/right/centre.

Another idea I wanted to pursue if I get another life time to pursue it,
was combining a Yamaha OPL3 or OPL4 chip and a SID chip. That would provide
some pretty sick sound. Using all 20 voices of the OPL3 as a single MONO
synth then filtered and combined by the SID chip. Ugh! Revenge of the toy
synths. :)

Be absolutely Icebox.

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