I have been trying to learn fretless bass for close to a year now. I have made quite a bit of progress, but I have a long way to go. My main problem at this point is accurately hearing the pitches at the lower range of my (5-string) instrument. My pitch discernment has gotten to be pretty good in the higher notes, but anything I play on the B-string, and quite a few of the lower notes on the E-string are problematic. I just can't tell where I am at. Sometimes when I am playing in this range, I KNOW that I am NOT in tune, but I don't know if I am sharp of flat. I would very much appreciate any advice. Thanks!!!!!