How to put a bass line into a song!!!! HELP!

[Jus2sic]

Hi, I have a new keyboard, but when i put arpeggios down on my computer, like hi-hat sounds for a beat, then when i want to add a bass line in each measure or count of the song, i have to play my ketboard throughout the whole song repaeting the bass lines, and some get off. So, my ? is, is the akai mpc 2000 good for this, becuase i tried it out and i think it will work, but my budget doesn't fit it, is there anything a bit cheaper than the akai mpc that will do this simple task for me?

[Dragon]

Yeah, your computer! Any MIDI sequencer program will let you replicate exact measures all you want.

[The Green Hornet]

Yo Ju2Sic to work?

Would it work out if you did the drum track first? Then, add the chords? Then, all by itself, add the bass track; Then, after adding whatever/vocal, mix them all down into a nice balanced mix. Sit down, make a martini, and enjoy your work.

Green Hornet