[sdiy] Tr-606 hats / cymbals

[Scott Nordlund]

The classic Roland (606, 808, etc.) metallic noise is 6 summed square 
waves.  You can do this with a hex inverting Schmitt trigger (40106 or 
similar).  The DR-110 hihat uses only 4 square waves, and the CR-78 
metal beat sound uses 3.  The similar Korg KR-55 and Wersi CX-1 use
8 square waves which are X-OR "ring modulated" in pairs.  I tend to 
prefer this sound.  The 808 and KR-55 cowbell, and CR-8000 rimshot
are also derived from these circuits.  The mixed square wave signals
are put through bandpass filters, usually different ones for hihats
and cymbals.  

I think the technique may have originated in organs where the chromatic
TOS signals were all summed and filtered.  I think organs sometimes 
had more sophisticated drum sounds than stand-alone boxes...

----------------------------------------
> Date: Thu, 27 May 2010 17:55:12 -0700
> From: dave at westphila.net
> To: onephatcat at earthlink.net
> CC: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Tr-606 hats / cymbals
>
> It's a few pairs of square wave oscillators ring modulated together
> using XOR gates if I'm not mistaken.
>
> Dave
>
> Joel B wrote:
>> Most analog drum synthesis I've encountered tends to be pretty weak on
>> the hi hats and cymbals, mostly sounding like hi pass filtered white
>> noise, but the 606 actually had metallic sounding hats and cymbals.
>> Does anyone know what technique Roland used to get this effect, and
>> suggestions on avenues of exploration to create more metallic sounding
>> analog percussion?
>>
>> - Joel
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>
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