MickMadSoft, dude-the metronome is off - the timing is not tight - if a person's CPU clock cycles alternate (and they can) then your software should compensate, just like the clicks in GarageBand, Logic, ProTools, Live, Reason and every other host musicians apps. Maybe a Slave to Host mode would help to straighten this out. Also, the tuner generates a tone that doesn't harmonically resonate with most stringed instruments, and that is why people are saying it sounds weird. When you tune you need pitch usually at 440 with no warble or variations. The idea of a portable tuner/metronome is old-hat, and there are several already out there. Also, if you are going to use the 'i' moniker it presumes that this little app will function inside Apple's iLife suite, namely Garageband. Since your app has no slave function it does not fit the bill, and probably ought to be renamed or re-written to work with GB (remember that GB already has a tight metronome and awesome tuner, so if you do re-work your app, you will have to improve on Apple's work) I think this is a beginner's stab at using REALBasic, and he got excited and posted it here. Perhaps when your programming skills are a little more refined, and you can handle some criticisms without freaking out, you will be ready to create a useful musician's tool. Until then, keep at it and try again.