Select the chosen CV Input in the Mod Matrix as source and Pitch as destination. Set Amount to 100%.
Go to Global>Settings>CV and set CV scale to about 2V (or less) which corresponds to the 2 Oct pitch amplitude in the mod matrix.
Each CV input can be individually scaled.
Press the encoder once or twice to do fine adjustment.

Iridium Desktop
For the function of the “Gate In” no special setting must be made. However, the arpeggiator (performance/autoplay) must be switched off. The red LED must not be on. Just press the button again until the LED is white. This is also the reason why an Init patch works with the gate and some other patches do not.

Iridium Keyboard
Go to Performance/Autoplay and select “off”.