I have over a hundred songs sequenced on my keyboard. I perform on the street, coffee shops, retirement centers etc. It does sequence the fills and variations. As the song is playing back I can also use the fill button, do variation changes, use fade and most other features (changes) that I want to do at a particular time on the fly while performing. However, it does not change the original sequence. I don't understand the term "looper."
A friend who told me about the sequencer on this arranger before I purchased it, later told me that the sequencer on the newer model Korg's weren't as flexible or as easy as my i30. So that is why I still use the i30. The sequencer is a necessity to me. I can't spend hours sequencing a tune.
I can change a bar in the middle of a song by just holding the chord and hitting the record button and turning it off immediately. At that bar, I can also go back again hit record and add a fill variation change etc.
Any way I'm elated with my sequencer. I also perform with BIAB tunes. The people are listening to my sax playing and don't care what is in the background. The same with vocals. I get complements but not for my keyboard playing. I don't claim to be a keyboard player. I'm still striving to be Dexter Gordon.
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I'm not prejudiced, I hate everybody!! Ha ha! My Sister-In-Law had this tee shirt. She was a riot!!!