I'll add here a little tip.
You can use the "wav" input of VOID to use any modulation signal. Simply put the lfo you want to act as the external signal in "clock mode" and set time to 1/1 and "wave" to "saw". Then the signal appears in VOID "wav" input pass unmodified to the modulation matrix.
You can use it to provide any modulation signal you 'd like.
For example: other scope signals, audio signals, VST signals (lfos, envs)
etc.
You can of cource overide VOID envelopes and for example drive AMP (or any other modulation destinations of the matrix) with external signals.
cheers,
John