Analogue-sequencer

I feel like I must be missing something obvious here, but am looking
for a way to transpose the sequencer's output in real time via MIDI. 

I have used the Xpose parameter, changing numerically the value, which
yielded favorable results, but I wish to transpose several sequencers
at once (in addition to the P3), via one master keyboard, while
triggering envelopes to fade the whole sequencing mess in...  

What am I overlooking?

Thanks in advance!

Gary