This is an 8HP mutifx processor based on the Spin FV-1 DSP chip.

Audio:
The hardware offers stereo in, stereo out. Level and mix control on both channels. The right hand input is normalised to the left hand input for mono in/stereo out (this configuration still provides independent level/mix adjustment for each channel).
Full stereo depends on the program running. A few are stereo in, stereo out. Many are mono in, stereo out. Some are mono in, mono out.
Suggested 32KHz crystal provides max 1sec delay times at ~15KHz bandwidth.

CV control:
The FV-1 provides three control voltage inputs. Dervish provides summed pot & external CV for each of these. External CV range is +/-5V with the corresponding pot centred. "Prog Adv" used to advance the program.

Programs:
11 banks of 8 programs. The FV-1 can address a single bank of 8 effects/programs stored in an external i2c EEPROM. Dervish expands support to 11 banks of 8 effects (binary + text) by using a larger EEPROM & storing the extra banks above the 4KB addressed by the FV-1. An ATTiny MCU provides the ability to switch banks by copying the new bank into the FV-1's addressable space. A 4-pin connector exposing the i2c bus is provided so you can customise the content of the EEPROM.

Physical:

Physical: 8HP, 35mm depth behind panel without power cable fitted
Electrical: Current 90mA @ +12V, 22mA @ -12V (current consumption is mostly the FV-1, so +12V will vary slightly depending on the running algorithm)

Default Installed Programs (4/11 Banks):

Bank: 0

Bank Name: uDervish Misc Reverb

Prog 0: PA Vocal

Prog 1: Large Hall

Prog 2: Small Hall

Prog 3: Stereo Plate

Prog 4: Large Stereo Plate

Prog 5: Tight Stereo Plate

Prog 6: v Tight Stereo Plate

Prog 7: Malekko Reverse Rev

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Bank: 1

Bank Name: uDervish Misc Reverb

Prog 0: PA Vocal

Prog 1: Large Hall

Prog 2: Small Hall

Prog 3: Stereo Plate

Prog 4: Large Stereo Plate

Prog 5: Tight Stereo Plate

Prog 6: v Tight Stereo Plate

Prog 7: Malekko Reverse Rev

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Bank: 2

Bank Name: Dattorro Mix Reverbs

Prog 0: 1k VarPrDelay VarDmp

Prog 1: 2k VarPrDelay VarDmp

Prog 2: 4k VarPrDelay VarDmp

Prog 3: 8k VarPrDelay VarDmp

Prog 4: VarFilter VarPrDelay

Prog 5: VarFilter VarDamping

Prog 6: 4k 1oct PShift I/P

Prog 7: 4k VarPShift I/P F/B

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Bank: 3

Bank Name: uDervish Misc Delay1

Prog 0: Drv102 1hd + reverb

Prog 1: Drv102 2hd + reverb

Prog 2: Simple Pingpong

Prog 3: Simple Pingpong 2:1

Prog 4: Dubbel Pingpong

Prog 5: Greenwood Delay

Prog 6: Dual LFO Chorus

Prog 7: St PitchShift+FB+Dly

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Bank: 4

Bank Name: uDervish Misc Delay2

Prog 0: drv103

Prog 1: drv103 + reverb

Prog 2: drv103 ppong 2:1 rvb

Prog 3: drv103 2hd 2:1 rvb

Prog 4: clksync echo

Prog 5: clksync pingpong 2:1

Prog 6: drv103 clksync

Prog 7: drv103 clksync pp 2:

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