Hi Shmuel,
I too has played a long time on the PSR-500, which was an excellent keyboard when it's came out, but it's not comparable to any of today's keyboards, of course. I too love this feature that you are able to "Conduct" a few songs together, but I think that the reason this feature is on the PSR-500, because the memory for each melody/chord track is very small, you cannot play more than about 700 notes in each melody track, and 150 in the chord track, so the PSR-500 let you combine all tracks together. But in the newer keyboards you can play in 1 recorded song over 100,000 notes, so there is no need for this feature. That's what I think, but not sure. However this is a problem, and it's an old one, and that's why I hate Yamaha, that in every new model they produce, some old features are missing. I can give you a big list. Even in my currently PSR-8000 is missing many features from previous models, as well in the PSR-9000 are missing some PSR-8000 features. What can we do? That's Yamaha!!! (By the way, why do you need 20 songs together? In PSR-500 you can combine only 5 songs together. It's 5 per page.)
But one other thing I like very much in the PSR-500 recordable songs, that you can playback your song while you're playing and auto accompaniment is ON. For example, you record just "Melody" track with a saxophone, and when you're playing a song with any other voice, just press the melody button so the indicator lights, and the recorded song will playback, like an automatic saxophone is playing in your background! No other model from Yamaha can do that!
That's YAMAHA...
[This message has been edited by Sam Noels (edited 01-19-2000).]