***** M68X *****
The M-68 has an unusual configuration of the mix pots, which lends itself to a simple implementation of in circuit position reading.
Except for the Aux Input, all the pots are DC isolated. A capacitor may be added to the Aux In line if it is necessary to record this value as well.
The mix pots are all commoned with respect to ground and "hot".
A small microprocessor such as a Microchip PIC 16 or PIC 18 series, some of which include 10 or 12 bit A/D converters could be connected to the pot wipers via a high value low pass filter to exclude the audio; Perhaps, 1M & 10uF.
The microprocessor power supply, which may also be the A/D reference, may then be connected to the "hot" pot common.
A small keypad and digital readout could be added to record multiple pot settings.
That's it for the hardware. Just a little assembly language software required, or a bushel of 'C'.
Recall would necessarily be manual via adjusting each pot while observing the readout, or in the simplest configuration Channel No. plus Up & Down LED's.
The M-68 has an unusual configuration of the mix pots, which lends itself to a simple implementation of in circuit position reading.
Except for the Aux Input, all the pots are DC isolated. A capacitor may be added to the Aux In line if it is necessary to record this value as well.
The mix pots are all commoned with respect to ground and "hot".
A small microprocessor such as a Microchip PIC 16 or PIC 18 series, some of which include 10 or 12 bit A/D converters could be connected to the pot wipers via a high value low pass filter to exclude the audio; Perhaps, 1M & 10uF.
The microprocessor power supply, which may also be the A/D reference, may then be connected to the "hot" pot common.
A small keypad and digital readout could be added to record multiple pot settings.
That's it for the hardware. Just a little assembly language software required, or a bushel of 'C'.
Recall would necessarily be manual via adjusting each pot while observing the readout, or in the simplest configuration Channel No. plus Up & Down LED's.