you create bass lines ...
assign your main loop (hell, ANY sample) to another pad and tweak THAT one to have all low-end and turn town - you have a bass line....
I know my explanation is kinda choppy - but you can look this up and have a WAY better explanation if you use the search feature on this site and type in "bass lines" or some shiitt like that
peace
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With knowledge ...
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Comes sorrow.
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.No Jesus? No peace. Know Jesus? Know peace.