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With MIDI only it would sound pretty pale given included synths. If they have good synths, the ones that cost money, likely they can afford base PRO version of BIAB that actually includes a lot for the price - $99. Likely goes on sale too. AND PGM OFFERS 30 DAYS MONEY BACK (they used to).

Yes, likely for "FREE" , PGM would get extra "users", but those users that "Of course they are looking for something free" are usually not the greatest (paid) customers. They would overwhelm customer support and PGM would have to either work for "free", or segregate paid customers from non-paying users.

The best option would be to offer 10-15 day trial, no money down. You like it - you buy it. You don't-no hard feelings.