I now use an external Midi Controller as Midi In for the NGEN. One knob of the external Midi Controller is mapped to Midi Channel 16 (global) with Midi CC 20 to Midi Start the transport of the Midi free clock with scale set to “0” and to Midi Stop the transport with scale set to “1”.
A second knob of the external Midi Controller mapped to Midi CC 22 whilst on Channel 16 helps to change the BPM of the Midi free clock.
Midi Clock in Clock menu must be set to Midi free clock.