expert sleepers es-4 (black aluminium panel) price : $295.00
es-4 (orange aluminium panel) price : $295.00
es-4 gate expander (black aluminium panel) price : $125.00
es-4 gate expander (orange aluminium panel) price : $125.00

the es-4 is a eurorack format module which converts a standard s/pdif input to five channels of control voltage.

two of the five channels are calibrated to provide over 5 octaves of 1v/octave pitch cv. the remaining three channels are general purpose outputs (for use as e.g. gates, envelopes, lfos) and each have a nominal range of 0-10v or ±5v (user selectable).

since s/pdif is a stereo-only format, the encoding of the five channels on to two is handled by software provided as part of expert sleepers silent way.

the es-4 will connect to any audio device using the s/pdif standard. this includes the digital audio output provided as standard on all recent macs.



specifications:
panel width: 8hp
module depth: 51mm
digital input: coaxial s/pdif, standard rates up to 192khz (*)
digital output: coaxial s/pdif
analogue outputs: 5x 3.5mm jacks, dc-coupled

output voltages
channels 1-2: 0-5.3v (when trimmed for 1v/octave response)
channels 3-5: 0-10v or ±5v (jumper selectable per channel)

d/a conversion: 8 bit, using high precision analog devices dacs
indicators: led for s/pdif sync lock; 2 leds per channel on channels 3-5 indicate output voltage (+ve/-ve)

expansion
5 headers for connecting es-4 gate expander modules (see below)
digital audio i/o header (i2s format) for future expansion
current draw: 50ma on the +12v rail, 20ma on the -12v rail (70ma total)

(*) while the es-4 is specified to run at 192khz, at the time of writing this has not been tested. operation up to 96khz however has been tested and verified.

the front panel is drilled for both doepfer and analogue systems mounting holes (using a 'slot' rather than a single round hole). the power connector is a doepfer standard 16 way idc, with -12v furthest from the top of the board.

software requirements:
unlike the es-3, the es-4 requires particular software in order to generate meaningful output signals. currently, the only such software is the 'es-4 controller' plug-in, part of expert sleepers silent way. silent way is available in audiounit and vst formats for mac os x and windows. use of silent way therefore requires a compatible host application (daw). for pro tools users, silent way is known to work with the fxpansion vst-rtas wrapper.

a silent way licence is not included with the es-4 - however, the es-4 controller plug-in functions in a licence-free mode, so es-4 users are not forced to buy silent way. such users can than evaluate the rest of the silent way suite in demo mode.

es-4 gate expander - introduction:
the es-4 gate expander is a eurorack module which works in tandem with the es-4 to offer 8 on/off outputs for use as gates, triggers, clocks etc. up to five es-4 gate expanders can be attached to one es-4 - one per es-4 channel. (the 8 outputs of the gate expander reflect the 8 bits of cv information passed to the es-4's dacs.) therefore you can combine the modules to create a system with up to 40 independent gate outputs - all driven from a single s/pdif connection.

specifications:
panel width: 4hp
module depth: 24mm
analogue outputs: 8x 3.5mm jacks, dc-coupled
output voltages: 0v/5v or 0v/12v, selectable via jumper in groups independently for channels 1-4 and 5-8
indicators: led per channel
the front panel is drilled for both doepfer and analogue systems mounting holes (using a 'slot' rather than a single round hole).

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