I've worked with Audacity before, but my present computer does not have a jack for an external microphone, and the built-in one is quite bad.Did you mean recording the audio and video at the same time? That is a good idea, I think I'll do that once I find a way to record the audio with a microphone.Thank you very much again, your advice is really helpful
As is often the case, the optimal position for video camera and mics are not at the same place. All-in-one video/mic recorders are convenient for practice sessions or casual Youtube vids. However, when one wants to improve upon the sound the video and mics need to be separated. One needs to balance convenience with quality.
First thing to check is that the mic auto gain is turned off (as mentioned earlier). Next you would do a recording level test to make sure the loudest sounds you are making are not clipping. Manually adjust the gain to do this. Turn off any compression plugins your device may have, piano does not sound good with compression. Limiters are ok if used sparingly and you leave ample headroom in your gain test.