I did this for a while in anticipation of my 10,000 Days birthday. I took that day off work and did nothing but play games, chill on the deck, drink beer, smoked a bit of weed and spun Tool's "10,000 Days" album after smashing a pizza down my gullet for supper.
You can download PowerTab or TuxGuitar for free. You can also sail the high seas and get the GOAT, Guitar Pro 5. With those programs you can download the Guitar Pro/PowerTab versions of the songs on UG and have all the full featured playback that you want.
Naïveté. Its not devs that set the price. Publishers do not have your best interests in mind. They will always choose to make more money. They don't give a fuck about literally anything else.
The prices will never be lower. Purchasing no longer grants ownership. This is why piracy is justified in a lot of cases.
Support devs that respect the community. Steal from those that don't. Or even better, don't play games whose publishers treat the community like shit.
Bass is the low pitched sound content of what you're listening to. Treble is the high pitched content. Literally if its something that sounds high pitched to you, that's treble. Anything in between the low pitched and high pitched content is called 'midrange'.
A bass drum goes "boom". A bass guitar goes "bump, bump, bump". Those all sound like low pitched descriptions, right?
A cymbal goes "crashhhhhhhhh" and a wind chime goes "twinkle, twinkle". Both high pitched sounds. When you adjust bass or treble, you're adjusting how loud the elements in those ranges of the audio spectrum are in the overall mix of the sounds you're hearing in your music/media.
If the "crashhhhhhhh" is too loud and hurts your ears, turn the treble down. Similarly if the "boom" is overwhelming, turn the bass down. Just adjust them to your tastes and that's all you need to know.