Bug: Instrument assignations borked

If you look at the instrument descriptions in #100945 for Slin you will see 'Sequencer' in remix step 4.

If you then look in the instrument descriptions of #101336 which is a remix of #100945, you'll see the description of remix step 4 has changed to match that of remix step 6 and it now says "Keys and trumpet and saxophone". Furthermore the remix description for step 3 by a different user (marocon) has been changed.

I'm guessing that steps that are originally tagged as "Sequencer" are being incorrectly modified.

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Something similar here: #101306 shows vocals and mixer in the session template, however if you go back up the tree to the actual template the original instrument was a sequencer (mine).

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