Kind of a complicated question but here goes. What I'm trying to achieve is a pedalboard situation where I can switch between my active and passive basses, match their output volumes, use a little bit of eq on the passive basses, and have a blend-able effects loop. At first glance the Radial Bassbone V2 seemed to have everything I needed plus some in one pedal. Then I read the bassplayer.com review which states: "The system worked beautifully, but I had one beef: The standard input impedance for both inputs is 220kΩ, which will reduce the high-frequency response of a passive instrument." Other caveats are that it uses a specific 15v power supply and there's no phase inversion switch on the effects loop. I didn't immediately write the bassbone off but I did start looking into other options which brought me to the idea of combining the MXR M81 Bass Preamp with an Xotic X Blender. The MXR has an input impedance of 2.2MΩ which shouldn't reduce the high-frequency response of my passives, it's a very clean and transparent preamp which is good because I don't want to color my sound, and it has an input and output control which theoretically I could use to match my active and passive basses volumes by leaving the "output" on the MXR the same and adjusting the "input" based on what was plugged in. For the effects loop if I combine the MXR with an Xotic X Blender I will not only get an effects loop with a phase inversion switch but also the ability to add gain and eq to the effected signal if needed and switch between a blended signal and a fully effected signal via the second footswitch. Buying these two pedals costs a bit more than just going with a Bassbone so my questions are: Has anyone tried using the MXR M81 Bass Preamp with both active and passives? Any issues with trying to match output volumes? Is the phase inversion switch that big of a deal? Do many modern pedals still have phase issues when blended? Can anyone with an Xotic X Blender comment on it's quality? Can anyone that uses a Bassbone V2 comment on it's performance with passive basses, not having a phase inversion switch on it's FX blend, etc, etc?