[sdiy] TR-909 Rimshot - Pulse Input

[carlile at ece.utexas.edu]

I'm building a copy of the TR-909 rimshot circuit.  I understand that a trigger 
pulse is fed to 3 oscillators to start them ringing and these sounds are then 
mixed.  The trigger passes through a capacitor, diode, and resistor before 
making it to the oscillators.  Can anyone tell me what the purpose of these 
components are for?  I'd guess some conditioning or shaping of the trigger is 
going on, but I'm not sure exactly what is happening.  I'm looking at the 
rimshot circuit here:
http://hardware.freepage.de/cgi-
bin/feets/freepage_ext/41030x030A/rewrite/raf909/rimshot.htm

I'd appreciate any help on this. THanks,
-Jim

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