These are old videos, but the BK-7m sounds pretty good. It doesn't sound "toyish" like some other low-end keyboards. This YouTube channel has lots of videos on the BK-7m. These are just a couple to get you started:

LATIN STYLES - https://www.youtube.com/watch?v=FSaSZa7M...t=TLswUh0LffxzU

JAZZ/BLUES STYLES - https://www.youtube.com/watch?v=pnEjdWUPizQ

Years ago, Roland was working on the successor to the G-70, but it never saw the light of day. Its research and technology however, went into the BK-7m. I think you'll agree, that for its low price, it sounds very good....except for its acoustic guitars, of course. Roland, in my opinion, never had good acoustic guitars. Not even in the Integra-7 module, or the Jupiter-80. It does have a "live" sound, though, like many prefer.