Starkeeper,
Actually I used to have the PSR-540.. Yes the 540 and 550 are almost identical.. What I like about the 550 is that is looks way better, the screen gives you 3 options of backlight color which is nice because you can adjust it to the lighting your playing in.. My big gripe is the speaker system on both boards.. It ticks me off that Yamaha even bothers to put those tweeters on the keyboard.. They don't even work! Yamaha just put them there for show.... As far as the 550 actually sounding better that the 540, I'm not so sure.. Yamaha claims the 550 has more than twice the mb's of the 540.. If this was true the 550 would have more than 12 mbs.. The 540 was 6 megs. I honestly think the extra megs went to the extra sweet and cool voices.. Plus there are some different guitar sounds that I think used that extra memory, they are folk pick guitars that have the sound of the pick actually plucking the string.. There are 3 of these guitars and they all slighty differ in sound... I agree that a "sweet" or "cool" piano would be a great addition.. One shouldn't have to combine several piano sounds to get a decent "grand" That's what I had to do..

Squeak

[This message has been edited by squeak_D (edited 10-23-2002).]