I would connect from your record out/tape playback on your amp with a Phono lead to your PC line in (Jack or phono depending on soundcard). Simple lead costs coupla quid. Mixer not needed but the signal is likely to be low. Then as Iv already said you need some software to record it.

respect energizer,that make sense to me,i might get a mixer sameway[inna while]cah me ol one get sold,was phono-them sockets the size of an arthur daley cigar star!still got the makings of a wem copy cat sumwhere too.sameway-energizer,niceness nuh man,ever ready with the tec advice,thanks man-will direct some o that chune we was talkin bout yourway,1st stop starstill lovin the broadway bredda,mi ah convert now!