TR-606 DIY part 2: PITCHSWEEP
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Let's begin with the main bassdrum.  If you look at Diagram 1 (dia1.GIF)
you'll see that it is very similar to (bd2.GIF), but it includes a
capacitor diode and pot which make up the sweep generator.  The diode is
connected to the high tom trigger output - this means every time you
program a high tom the circuit will sweep the bass drum pitch.

Some interesting effects can be achieved by programming the sweep off
beat from the bass drum.  This circuit can simply be soldered onto the
sweep decay pot (see picture dia1.GIF).  There's only one minor drawback,
and that is that the high tom sound is lost, but I'm sure you can live
without it [not me! - ed].