Complex sentence: Wanting to have the bass synth sound very big, Ahmadzaï used a Nord Lead synthesizer with lot of filtering manipulations, but faced problems with it and used a Yamaha O2R mixer.
Split into simpler sentences: Wanting to have a loud bass synth sound,, Ahmadzaï used a Nord Lead synthesizer with lot of filtering manipulations. But he faced problems with it, so he used a Yamaha O2R mixer.