Umbra is a dual channel feedback processor with three discrete transistor core VCA pairs.
Route any eurorack-level effects, compressors or filters through its send/return paths to create feedback loops ranging from subtle textured echoes to howling walls of sound. The input level VCA is positioned before the feedback circuit, allowing time based sounds to fade naturally when the VCA is closed. A soft clipping stage after all feedback keeps levels controlled while adding nonlinearities and character. The left-right channel normalling allows for both mono-to-stereo or true stereo operation.
Features
- Discrete transistor core VCAs for input gain (L and R)
- VCA pair for return gain, and VCA pair for feedback amount
- Switchable between stereo operation and serial mono operation
- Serial = the output of the left channel enters the input on the right channel, doubling up on feedback and processing, indicated by the colour of the LEDs
- Orange L and R channels = Stereo operation, Orange L channel, Blue R channel = Serial operation
- Asymmetric diode soft clipping distortion at output
- Level LEDs for input level and return level, to keep feedback, drive and gain under control
Power: +12V 102mA / -12V 44mA
