I've got two Ensoniq keyboards (ESQ1, SD1). One of the reasons I bought the ESQ1 rather than (say) a Yam DX7 was the inbuilt sequencer. I got the SD1 because it had a more flexible sequencer and critically a floppy disc (yes I know I could have maybe got an SQ80 but this didnt move the sound capabilities onwards and I like to upgrade for more than one good reason at a time!).

On both of these keyboards I became very adept at using the on-board sequencers.

However when I lurched into Midi Files things changed wholesale. I got a PSR630 because a Hotel my duo (KEYS/DRUMS) play's at were badly short of a midweek "SINGALONG" solo act so I gave it a go and discovered that you really need some help with the backing. I got the 630 because it used XG (and I had an MU80 so I knew about XG) and played back Midi Files from a PC floppy. At this point it was clear that I would use a PC to edit and create midi files because the editability of the sequencer on the PSR630 was abysmal even compared to the ESQ1.

So I 've been a Cakewalk/Sonar person ever since.

The PRS2k sequencer is still woeful in comparison to the PC or the Ensoniq, but I can use it to do remix / revoices so that can help.

So - I use the sequencer on the 2k only to replay midifiles. I only edit using it if a really have to, and then only to do very basic things.