Hi Marcino,
Don't know why the knobs are stuttering like that, I've never used my controller with Soundiver.
I can help with your setup though:
Connect the MIDI Sport 4x4 up to your PC's USB port in the back and then:
Controller [midi out] --------- [midi in A] MIDI sport
midi sport [midi out A] ------- [midi in] Virus
Then connect audio cables from the two outputs on the back of the Virus to the input on your PC SoundCard. In the PC sequencer select MIDI out A and it will record stuff to midi (provided the midi thru button on the MIDI sport is not pressed down). If you want to hear your Virus play without the sequencer on, press the MIDI thru button.
The connections above should allow you to transmit patches from Soundiver to the Virus, but if you want to transmit your own patches from the Virus into Soundiver, you need a [MIDI out] connection from the Virus to a [MIDI in] on the midi sport.
