Change of tonality Is This Love

I would like to ask a question, in case someone of you knows.
I have tried to edit the song Is this Love by Bob Marley with the BeatBuddy Manager (He is with NP Standart Bass Hammond) to try to tone down the Bass and the Hammond, but it seems an impossible task. because it costs a lot to load the program. I do not know if anyone of you knows how he could do it.
Thanks in advance.