The ES30/ES31 is an expandable studio quality output mixer. From a minimum of 2 channels it is expandable up to as many as you can fit in a row in your rack! This Stereo Mixer is an indispensiable aid for live music performance or can be used with appropriate computer control for automated stereo mix-downs in the studio.

The minimum configuration consists of 1x ES31 Stereo Output Module providing the user with a 2-channel panner-mixer output module. ES30 modules can be added to expand the number of input channels

The ES30 comprises 2 identical single channel stages. Each input feeds a VCA whose gain is set by a manual [GAIN] control and a control voltage [GAIN CV]. The manual control sets the level while the CV control shapes the sound. Nominal range of the CV is 60dBs with a taper of 12dB per volt.

The VCA is then routed to an "equal power (c)" panning circuit which acts to accurately position sounds in a stereo sound field. There are two manual controls to the panner - a [PAN] control to set the sound anywhere from fully L(eft) to fully R(ight), and also a [PAN CV] input jack and control which serve to set the amount and direction of a CV's effect on spatial location. With the control set clockwise to 'R-L', a positive going CV will move the sound from right to left, When set to 'L-R', a positive CV will move the sound from left to right. The [PAN CV] control can thus be set to effect quite subtle spatial results.

(c) "equal power panning"' is the copyright of Serge Modular, 1976.