some notes countinue, even though I stop those notes.

I'm using i-pad. connecting with my digital piano roland fp90, and play the piano and some notes countinue like that, even though I stop that notes. I have both i-pad and android galaxy tab. That problem appears in both i-pad & galaxy tab.

I try that in synthesia. But it's ok in synthesia.

That means connecting with digital piano is ok.

Only in seemusic that problem appears.

Please let me know what problem is or please fix that problem.