Hey gang! I've had an Ampeg SCR-DI for a couple of years now. I have always used it for silent home practice with my Sony MDR-7506 headphones and my mp3 music source. I love the way the SCR-DI imparts that nice Ampeg tone. IMO, the SCR-DI is a *phenominal* gizmo for silent home practice. I also have, for low volume (non-silent) home practice, a Markbass Micromark 801 amp...the cube-shaped amp with the 8" speaker and 60 watts of power. I was never really overly enamored with the tone from the 801. As you may know, other than the volume knob, all it has for tone shaping is the VPF knob. It does not have the more common bass, mid, and treble knobs that many amps have. So tonal adjustment is quite limited. All five of my basses are passive (two P basses, two J basses, and a Ric), so I don't have the flexibility to adjust those tonal parameters like I would otherwise have with a bass that has a built-in preamp with bass, mid, and treble adjustments. Well, today I tried something. I plugged one of my basses into the SCR-DI, and then ran a cable from the "line out" 1/4" jack from the SCR-DI directly into the front-end input of the 801. SHAZAM! There it was! The yummy tone of the SCR-DI coming out of the 801. Why I didn't think of doing this before is a mystery that I will never understand. I guess my 63 year old brain just doesn't think as quickly as it used to. And now I have lots of tone shaping options at my fingertips for the 801 by using the knobs on the SCR-DI. It turns out that the "line out" 1/4" output of the SCR-DI is not as strong as many typical line-level signals. In this case, that's a good thing, because the 801 does not have a power amp in jack or an effects loop (with an effects loop return jack), nor does it have a pad adjustment for the input for signals that are too hot. All it has is the single 1/4" input jack by itself. I was initially concerned that the line out signal from the SCR-DI might be too hot for the 801's front end input to handle resulting in ugly sounding distortion, but such was not the case at all. As long as I don't crank the volume knob on the SCR-DI too far, it won't overdrive the 801. AWESOME! Of course, the *XLR* output jack from the SCR-DI is hotter than the 1/4" line out jack (6db hotter to be exact, per the manual). So for those of you who want to use the XLR out to go from the SCR-DI to the mixer board, no worries. I am very pleased that I am now able to get a nice Ampeg-like tone at bedroom volume levels (and have lots more tonal adjustment capability) using the SCR-DI as a preamp running into my Markbass 801 amp. saWEET!