CP format
This Module is currently available.
Attenuator, Mixer, Multiple
The M 525M ATTENUATOR/MIXER combines the functionality of the 525 Reversible Attenuator und the 526 Reversible Mixer: Four input channels with mute switches and LEDs, doubling as separate attenuators.
Master outputs with inverting and non-inverting output jacks and master level knob.
These merchants probably sell this module. Huh?