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Subject: '485 'grit'

From: "Paul Schreiber" <synth1@...>
Date: 2005-07-19

>
> Sounds great! :)
>
> Since there are G1-inspired filters, did the G1 originals
> have the same gritty character? I always assumed the G1
> was a very smooth synth.

The resonance of the '485/GX-1 is done in a very odd way, and is a function of
the harmonic content of the output. There is a trim pot that allows you to
"tame" this down to a degree. The original VCF was done as cheaply as possible
using diodes as the control elements. And Sallen-Key filters sound a little odd
as well.

The GX-1 has limited waveform selection and really not that wide of a tonal
palette (I call it 'squonky'). Also, the cutoff frequency range of this topology
is not nearly as wide as OTA-type filters (it's about 100Hz to 8Khz).

But it does sound ∗completely different∗ than any other MOTM filter, and that's
a good thing :)

Paul S.