THe difficulty with the PMA-5 and the QY70 is the track layout. For example, on the PMA-5 tracks 1,2,3,4,5,6,7 and 10 are used. Tracks 5,6,7 and 10 are reserved for patterns only. Track 4 is also the only other track that can be used for drums.
Check the 70 manual to see if only track 8 of the sequencer can be set to receive/record drums - outside of the pattern track.
Hope this helps.