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I did this mod couple of years ago.. .
However, I didn't want to pay M$ for manufacturing 47 teeth timing pulley (which is not standard), instead I went with modifying the electronics to accommodate ANY gear ratio..
My (and this was done by many others) solution is 60-teeth timing pulley (from SPI SI) combined with 12-teeth (on stepper).
For the electronics and software/firmware, there are many options, one of them is definitely PIC_GoTo.
I went for Pololu step-motor driver modules and SoundStepper software.
EDIT
If I remember correctly, there is a way to enter a different gear ratio in the EQ6 firmware (at least some versions)..
When I find this info, I will post it here.
I hate when people pay way to much to various "entrepreneurs" for something that needs only a little bit of different effort (in this case, firmware parameters entry)
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