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CR-8000 Voice Output Swapping

CR-8000 Voice Output Swapping

February 18th, 2011  |  Published in Roland CR-8000

Here is some info on swapping the CR-8000′s voices to different voice groups. This is useful if you’re installing the individual outputs and want certain voices to go to certain outs. For example, if you’ve done the Tom mods, you might want to give them their own output since they now sound so rad. Say you’re using the Toms as kick drums. Having them on their own output will give you a lot of flex when recording or performing; you can mix them to bring out all their new bang without having to worry about messing up the Snare Drum mix (by default the Toms and Snare share the same output).

As always, I may have made a couple of mistakes here. I wrote this up by memory and according to the voice board schematic. I’m a little unsure of the Clap components I’ve marked in the labeled schematic, but since it already has its own output you probably don’t need to worry about swapping it. If you spot any errors, please post here and I’ll make the corrections.

Swapping the voices is just a matter of re-routing the signal from one location on the voice board to another. I’ve found it’s easiest to just disconnect one side of the voice’s “last” resistor (before going into the voice group’s op-amp), solder a wire onto the free end of that resistor, then run the wire to the desired location on the PCB (into the new voice group’s op-amp).

Below is an example of swapping the Toms with the Clave. R38, R35, and R39 are the Toms and Tom Noise. De-solder the ends of the resistors (marked in red) and solder them to a wire. Then run this wire over to the empty hole of R106, which will be de-soldered in the next step.

Now de-solder the end of R106 (marked in green) and solder it to a wire. Then run the other end of this wire to one of the empty Tom locations (R38, R35, or R39).

The Toms and Clave voices are now swapped. The Toms are now on the Cowbell output and the Clave is now on the Snare Drum output. When you adjust the associated voice group level pot, the volume of the voices will change accordingly.

If you want to swap other voices around the process is the same, you just use different components. Take a look at the labeled voice swapping Voice Board schematic. It shows all of the voice components and locations on the PCB needed for voice swapping.

Note that when you’re swapping voices, you’re also routing them to different op-amps (IC1 and IC5 in the above example). This will effect how the voice sounds slightly. You can experiment with changing the resistor and cap values of the op-amps to match the original tone of the voice.

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