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Volume discrepancy between clean and dirty tracks.

Hi again fellas. I have a quick qustion about recording levels. I record into a Tascam DP-008. I run a clean signal from a Zoom B3 via XLR cable and a dirty signal from a Fender Rumble 350, also via XLR. My signal chain is Bass > Zoom B3> Fender Rumble in this case. What's odd is that the pre-effects out from the Zoom B3 is much louder than the signal coming from my amp. I guess I would have expected the signal from the amp to be much louder, but it's actually much lower and when I turn up the volume I tend to clip on the Tascam unit. Is there anything that I can do to help the volume out of the amp or adjust the Tascam to better pick up the volume and avoid clipping? I can hear the bass along with the track I'm playing with largely due to the volume of the clean signal, but I'd like to hear the dirty track a little better and record a solid version of it.

For what it's worth, I pull the tracks into Audacity and Normalize along with the track I'm recording with. The tracks are OK when mixing, this was more of curiosity and volume question.Hi again fellas. I have a quick qustion about recording levels. I record into a Tascam DP-008. I run a clean signal from a Zoom B3 via XLR cable and a dirty signal from a Fender Rumble 350, also via XLR. My signal chain is Bass > Zoom B3> Fender Rumble in this case. What's odd is that the pre-effects out from the Zoom B3 is much louder than the signal coming from my amp. I guess I would have expected the signal from the amp to be much louder, but it's actually much lower and when I turn up the volume I tend to clip on the Tascam unit. Is there anything that I can do to help the volume out of the amp or adjust the Tascam to better pick up the volume and avoid clipping? I can hear the bass along with the track I'm playing with largely due to the volume of the cleaen signal, but I'd like to hear the dirty track a little better and record a solid version of it.

For what it's worth, I pull the tracks into Audacity and Normalize along with the track I'm recording with. The tracks are OK when mixing, this was more of curiosity and volume question.
 
I don't know much about those Tascam things, but you should have a way to turn up the input gain/trim on the channel coming from the amp, no? Turning up the volume on the amp is just making the amp louder - you need to turn up the input signal of the Tascam input channel.

Alternatively, you could try the Rumble headphone jack or FX send --> Tascam
 
If turning up the input gain on a channel of the Tascam results in clipping that indicates that the signal peaks are exceeding 0dbfs. That's as loud as it can get. The only way to increase perceived loudness relative to the same peak level (i.e. dbRMS vs dbfs) is to reduce dynamics, which is commonly done by implementing compression, be it peak limiting or more "normal" compression.
 
The line out on the Rumble is affected by the volume on the Rumble. IMO that’s not a good recipe when tracking. I’d find another way to get a dirty signal like a pedal, Sansamp, amp modeling, etc.