I play my music through my laptop (using "Transcribe") with headphones...and I play my bass through a Peavey Microbass, which has a headphone out jack. I've tried to use a splitter and plug my headphones into both my laptop headphone jack and the headphone jack on the bass amp. I can hear my bass and my laptop through the headphones at the same time, but there is alot of noise. What would be the least expensive way to hear both sources through my headphones at the same time? I don't need anything more than that. I found a Rolls MX41 (4 input, 4 volume controls and one output) passive mixer for $21. Would that eliminate the noise and offer more control over the sources in the headphones? Both my laptop and bass amp have headphone outputs going into the mixer so I do not need a powered mixer. Just a way to get both sources into my headphones at the same time. Any thoughts?