Hi Perrodiablo,

When you purchased BIAB, you purchased the right to use all aspects of the program freely to create and sell songs. There are no royalties that need to be paid.

Good luck with writing your music!

All the best,

P.S. To answer your question about playback quality, click on the Songu link in my signature below and have a listen to "Brighter Than Any Star" or "Storms". Apart from my singing, all instruments and drums in these songs are from BIAB/RB. I composed the songs in BIAB, refined the tracks in Realband and then loaded the individual tracks into Sonar. In Sonar, I then recorded my vocals and mixed what you are hearing. I'll let you be the judge of the instruments' sounds.