Archive of the former Yahoo!Groups mailing list: MOTM

Another thing to note about the sound of the GX1 voice vs. the CS voice
is the VCO normalization:

http://www.cs80.com/gx1voice.gif

http://www.cs80.com/csvoice.gif

The GX1 VCO routing is just slightly more complex. ;) The thing to note
here is that the MOTM "GX-1 filter(s)" are described in gx1voice.gif by
the text "to Sallen-Key HPVCF, LPVCF and final VCA." The BPF and HPF
shown as harmonic selectors for the sawtooth and variable pulse waveforms,
while being the same design as the VCHPF and VCLPF, aren't in the CS voice
at all, so a comparison of the GX1 S-K and CS-80 SVF filter models really
doesn't quite work out if the VCOs driving them are different. (Though
even if the CS VCO normalization is the simpler one vs. the GX1 VCO, the
CS VCO ∗chip∗ is more complicated then GX VCO discrete module...more on
those projects some other time.)

If anyone read my notes on cracking open the NE filter modules, it
becomes apparent that the popular myth that CS-80 voice = chipped version
of GX-1 voice isn't true. What is correct is that both used 'dual layered
voicing,' where each voice is actually two voice circuits operating in
parallel, up to a total of eight sounding at once (16 voice circuits in an
8x2 fashion). For the GX1, this is the case for the both upper and lower
manuals. The solo manual is a single, unlayered voice, and the pedalboard
is a triple-layered voice. The CS-80 has of course one manual operating a
dual-layer voice.

I guess the important thing to note here is that using something like an
MOTM-310 driving two MOTM-485 GX1 filters or a single MOTM-480 filter will
obtain different tonalities. The 480 is (in my opinion) more silky /
sibilant whereas the 485 is more brassy. Both provide that unmistakable
Yamaha ensemble strings/brass sound, however.

Crow
/∗∗/

On Tue, 4 May 2004, edibennardo wrote:

> --- In motm@yahoogroups.com, "supisuzoi" <son_of_zoggs@c...> wrote:
> > can we hear some audio samples from the gx-1?
> >
> > kevin
> Aaron Copland's "Fanfare for the common man" in the ELP "version"in
> Works1 (Manticore)
> Enrico (Sicily)