First off, I love the rd 700, the action is perfect, and the sound is amazing with the srx 02. But on the E above middle C, there is this small whistle sound after the note is played. It is very quiet, (it kind of sounds like air blowing out of a bellows) and it is driving me insane. It is only present when I use the expansion board. Has anyone else (that has the rd700/srx02) noticed this? Could it just be the sound of the piano it was sampled from? I only have experience with a few pianos (no rare concert grands), so perhaps it's normal. The board isn't damaged since everything else works (well the srx02 bass notes sound muddled, but I'm sure that's my cheap headphones). I'm sorry to ask this, but I'm paranoid and about to lose my mind. Thanks.