I am interested in buying a Tascam 424 mkIII. I wish to use drums, bass and vocals on 3 of the 4 stereo tracks available. I would also like to use 2 guitars on the mono tracks (one in L and one in R). It says there are 2 mono tracks or L only, does this mean I can only record on the L side on mono? Or does the L buss and R buss have something to do with this as I do not know what this means. Help greatly appreciated, Thanks.