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Roland CompuRhythm CR8000 Voice Modifications by
Josh Gumiela |
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VOICE |
PARAMETER |
PCB LOCATION |
POT VALUE |
NOTES |
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BDM |
DECAY w/norm |
R29 |
B100k w/33k series |
see bass drum decay mod schematic |
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TUNE 1 w/norm |
R1 |
B5k w/10R series |
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TUNE 2 w/norm |
R7 |
B25k w/10R series |
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BOOST 1 w/cut |
R30 |
B50k |
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BOOST 2 w/cut |
R28 |
B50k |
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SNR |
BOOST 1 w/cut |
R33 |
B10k |
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BOOST 2 w/cut |
R32 |
B10k |
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TUNE 1 w/norm |
R94 |
B10k w/10R series |
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TUNE 2 w/norm |
R79 |
B25k w/10R series |
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SNAPPY |
R34 |
B100k |
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NOISE w/cut |
R93 |
B100k |
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DECAY |
R100 |
1M |
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RIM |
BOOST |
R36 |
B100k |
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TUNE |
R273 |
B100k |
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HPF |
R269 |
B25k w/82R series |
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CLP |
BOOST |
R206 |
B100k |
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BPF |
R148 |
B25k w/82R series |
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SNAPPY |
R202 |
B250k |
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REVERB w/cut |
R241 |
B250k |
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DECAY |
R262 |
B500k |
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OFFSET |
VR10 |
B10k |
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HH |
BOOST |
R185 |
B100k |
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HPF |
R160 |
B100k w/5.1k series |
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CYM |
BOOST |
R186 |
B100k |
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TUNE w/norm |
R228 |
B100k w/33k |
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BPF |
R218 |
B2k w/120R series |
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DECAY |
R236 |
B2k |
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OSC 1 TUNE |
R223* |
B500k |
*schematic says 390k but 330k was in place |
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OSC 2 TUNE |
R221* |
B500k |
*schematic says 470k but 430k was in place |
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OSC 3 TUNE |
R219* |
B500k |
*schematic says 390k but 650k was in place |
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OSC 4 TUNE |
R232 |
B500k |
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OSC 5 TUNE |
R231* |
B500k |
*schematic says 470k but 510k was in place |
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OSC 6 TUNE |
R226 |
B1M |
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HPF w/norm |
R191 |
B500k |
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CLV |
BOOST |
R106 |
B100k |
swapped outputs: clave routed to snr/rim; toms routed to clave |
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TUNE |
R110 |
B100k w/1k series |
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LCG |
BOOST |
R131 |
B50k |
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TUNE |
R127 |
B2k w/33R series |
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MCG |
BOOST |
R132 |
B50k |
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TUNE |
R143 |
B2k w/51R series |
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HCG |
BOOST |
R134 |
B50k |
for better boost: IC side of R137 (use 18k) to non-diode side
of C70; this cuts out the 'clamp' path |
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DECAY |
C71 & C72 |
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for longer HCG decay: same as bass drum decay mod - 2 330k
resistors, 1 .047uF cap, 68k resistor to gnd |
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TUNE |
R195 |
B2k w/68R series & 3k |
soldered .022uF caps across C71 and C72 to drop pitch; 3k
resistor across pins of B10k pot; 68R resistor is series to prevent noise at
high end of pot |
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CBL |
BOOST |
R72 |
B25k |
R35 (tom noise) to R72 (cbl) to switch outputs |
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OSC 1 CUT |
R68 |
SPST switch |
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OSC 2 CUT |
R69 |
SPST switch |
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TUNE 1 w/norm |
R57 |
B1M |
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TUNE 2 w/norm |
R62 |
B1M |
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FILTER |
R70 |
B10k w/10R series |
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DECAY |
R67 |
B50k |
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LTM |
BOOST w/cut |
R39 |
B5k |
R38 and R39 (low&hi tom) to R106 (clave) to swap outputs |
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TUNE w/norm |
R9 |
B5k |
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HTM |
BOOST w/cut |
R38 |
B5k |
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TUNE w/norm |
R42 |
B2k |
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TOMS |
SNAPPY |
R35 |
B100k |
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NOISE w/cut |
R45 |
B50k |
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SYSTEM |
NOISE |
VR11 |
B10k |
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