This is really not a specific setup question as far as you’re concerned at this stage, you can read across virtually every lesson and comment (and there are many) on the existing threads if you search for A4 CV setup etc
It looks like you need to investigate the comments relating to the cable setup, I know I’ve commented on that a lot … if you don’t have a TRS to dual TS cable where the TRS-T and TRS-R are separated out then there are ways to work around this, again, covered in general discussions about this
If you want to sequence traditional ‘gating’ notes from the A4 then you need to send the gate and pitch out and your cables need to keep these signals separated … The pair of TRS out sockets on the a4 can be set up to behave as two TS outs if you don’t have a splitter(or insert type cable / breakout box) - so it’s possible to get basic sequencing up and running, then you can investigate the fun of using 4 CV channels and the flexibility of value-lin