does anyone know how to get the bass from an old song using filtering

umm i'd prolly use the isolator to kill the upper frequencies i.e. all highs and some mids.

I use excessive resampling to accomplish this. Isolator... cut hi and mid all the way.. and cut the low by half-3 quarters. Then I EQ with the bass all the way up and the his and mids cut, then vinyl sim...just using the compressor. and then maybe a little EQ again or maybe chorus... or w/e.

i like taking away everything except the lows with isolator. if its a one note short bass hit, then i try to make it loud enuff to distort when resampling. then take it to the eq and take away everything except the lows.

i also like to take out everything except the lows with isolator. then eq out some of the lows and add mids. so the bass has more presents on small stereos.