I have a couple of songs of an uncle that passed away that were recorded on cassette tape. obviously, they are mono. the guitar is way too loud compared to the voice and I was just wondering if there is a way to play with the frequencies in order to bring out the voice a bit more. also, is there a way to just make the songs louder and with better quality?
There’s probably not a huge amount that you can do. A bit of “Noise Reduction” may help, but it is very important not to over-do it. You can probably reduce the level of background hiss, but if you try to totally eliminate it the remaining audio will sound terrible (all metallic and bubbly). See here: http://wiki.audacityteam.org/wiki/Noise_Removal