Can anyone here offer a direct comparison of these two onboard pre's? Both offer vol, blend, mid w/freq select (both very near 250/800), and concentric treb/bass, which will fit them both perfectly into my 4-knob Conk GrooveTools. Except the Aguilar has a separate switch for the freq select, which means I'd have to drill a hole in my baby... The thing I'm most interested in is tone. How do they compare?