Currently, in order to play/transpose the Sequencer (like you would in Arp mode)
you have to press the "Pattern ▶" key to hold the Sequence then Shift+ play the note..
Hold/Play Sequencer like Arp
Please consider making the HOLD button work in Sequencer mode like in Arp mode:
which is to Hold the last note you play on the keyboard.
IMO It would be more consistent from a user point of view.