This Module is currently available.
Filter Mixer for Q107
Use the Q162 Filter Mixer next to your Q107/Q107a Filter to easily create new sounds. Simply select the amount of High Pass, Band Pass, Notch, and Low Pass response used to contribute to the final waveform which is available at 2 connectors.
The Q162 is connected to the Q107/Q107a Filter using cables behind the panels. Requires exchanging connectors on the Q107/Q107a filter. Soldering not required.
These merchants probably sell this module. Huh?