Le TUNE est il contrôlable par CONTROL VOLTAGE ?

The TUNE input is originally intended to use with a pedal as external tune control, so it uses a stereo jack (tip-ring-sleeve format) with the "ring" contact as CV hot pin. However, and since this unit is provided without that specific pedal, that jack was modified to be used as an external voltage control, with the "tip" contact as CV hot pin, so you can use a standard mono plug to feed it with control voltage.

The Syncussion VCO's are not designed to be used from a standard 1volt/octave control voltage. Nevertheless, and since the TUNE input modification allows to connect an external CV control, at least the channel 1 section has been calibrated to play it tonally from a 1V/octave mono keyboard's control output.

The character of the Pearl Syncussion resides on its very unusual design on its VCO's and VCF's. It uses a non-standard structure, at least the typical structure you can usually finds on a regular 1V/octave VCO with temperature compensation, so they has a very rough and non-linear behavior (despite the modification on the channel 1 section).