[sdiy] TR-808 HH patch on modular

[gregory zifcak]

if you look at the 808 schematics, i believe the oscillator circuits have 
the periods annotated in milliseconds. you can get the appropriate 
frequencies by dividing 1000 by the milliseconds.
i believe that at least the cymbals have multiple vcas and decays as well as 
filters, so that the frequency content changes over time.

another interesting approach (korg kr55) is multiple squarewaves ring 
modulated.

the 808 snare uses two ringing bandpass filters for the tone portion, and 
filtered white noise for the noise portion. there maybe multiple band/hi 
pass filters here as well. i believe the tone and noise portions have 
separate decay times.

greg


>From: "Cecil Grey" <knightofpan at sexkult.org>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] TR-808 HH patch on modular
>Date: Fri, 27 Oct 2006 18:48:00 -0400
>
>Can anyone with a familiarity of the schematics of the TR-808 hihat section 
>give a close approximation on how to simulate this sound on a modular 
>system (MOTM, for example)?
>
>I tried white noise into a HPF with a little resonance in the upper-mid 
>freq, but it lacked that "bite" that the 808s has. But perhaps it depends 
>on the filter choice?
>
>I've used samplers for many drums sounds, but have never been content with 
>sampled 808 HHs (or 909 bass drum for that matter) compared to the real 
>thing.
>
>Ps - Oh yeah, any hints at an 808 snare patch would be great as well ;)
>
>+/- Cecil
>

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