User manual

New Inputs, Outputs, Controls and Functionality

This is a list of Devil Fish features with a brief explanation. The exact voltage levels etc. are

detailed in later sections.

CV Inputs

CV and Gate inputs. The CV and Gate outputs remain available too.

Two Control Voltage inputs to activate the Accent and Slide functions. The Slide input

also activates the Gate function at a higher input voltage

Separate CV In to drive Filter Frequency in addition to the other internal signals which

drive it.

CV Outputs

Accent out. + 6V signal to be used with CV and Gate outputs to drive another Devil Fish.

The TB-303’s CV and Gate outputs remain.

Audio Inputs

The Mix In socket is changed to External Audio input to the Filter. This means the Devil

Fish can be used to process external signals via the Filter, VCA and Muffler. This signal is

fed directly into the filter, along with the oscillator signal which passes through the

Overdrive pot.

The tip of what used to be the headphone jack, is now the Audio Filter FM input. (When

using the special audio lead, this signal appears on the White connector.) This allows audio

frequency modulation of the filter circuit. This is a sensitive input with AC (capacitive)

coupling, so only the audio frequency component (say 5 Hz and above) of the input voltage

affects the filter frequency. Some extremely complex and interesting sounds can result,

depending on the nature and level of the audio signal driving this input.

Audio Outputs

The Headphone output does not exist on the Devil Fish – its socket is used for the Audio

Filter FM input and the Filter Out signal.

The Filter Out signal appears on the ring of what used to be the headphone jack. (When

using the special audio lead, this signal appears on the Red connector.) This is a line level

output of whatever the filter is producing – the same signal which drives the VCA. This is

intended to be used to drive external synthesizers, or to drive some external processor such

as a reverb, distortion box etc. – the output of which might be fed back into the Audio Filter

FM input or the Mix In. The level at this output is not affected by the volume control. The

filter is always producing an audible signal, provided either it is self-oscillating, or the

oscillator and/or external audio signal is feeding the filter and the cutoff frequency is above

some harmonics of those signals. This output signal does not depend on notes being played

to activate the Volume Envelope Generator which drives the VCA.