TR-606 DIY part 2: SNARE MODS
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The snare modifications are very easy to achieve.  Altering the snare pitch
and noise filter involves removing two resistors and replacing them with
pots and fixed resistors.  For the pitch modification, remove R112 and
replace it with a 470K resistor and a 1 meg pot.  See diagram 3 (dia3.GIF).
This will allow you to tune the snare up and down about two octaves.

The snare filter is a hipass filter that shapes the noise into the snare
rattle.  This modification allows you to sweep the filter cutoff frequency
up and down.  Remove R153 and replace it with a 390 ohm resistor and a 100K
pot; this control make the snare sound like a 909 snare. See diagram 4
(dia4.GIF).

To modify the snare decay you must solder a 2.2uF electrolytic capacitor
across the back of C35 (be careful to get the polarity same as C35) and
then solder a 5.6K resistor and a 100K pot to the 2.2uF capacitor shown on
the diagram 5 (dia5.GIF).  Now you can have short and tight, or long and
noisy snare drums.