Okay, I'm stumped and need help. What I have:
iPod Touch 4th Gen (iOS 6.0.1)
iRig
Peavey AmpKit Link
Amplitube (full version)
JamUp (with Bass expansion pack)
Male-male mini-headphone cable to connect headphone out to physical amp's Aux In
Custom molded in-ear monitors
No matter what combo of software and hardware I use, if I plug my in-ears into the iRig/AmpKit Link, I can hear everything just fine. I can play backing tracks and play along with them and I am able to get the audio levels dialed in so I can hear the music and the bass at the volumes I want.
But, no matter what combo of software and hardware I use, if I connect the headphone out (of the iRig or AmpKit Link) to the Aux In on my amp, I cannot get the bass to be very loud at all. I can play backing tracks on the iPod (either in Music or using JamUp's Jam tab) and they come out loud and clear through my amp. But, I cannot get the bass guitar that I'm playing to come out much above the volume of a soft conversation.
The example I just tried was:
Bass -> AmpKit Link -> JamUp -> SVT Blueline model (nothing else in the chain) -> headphone jack -> physical amp Aux In
In JamUp, I turn the Volume all the way up and turn the iPod Volume all the way up and with my physical amp volume set to 10:00, I can barely hear the bass guitar coming out of it. But, if I put JamUp into Background mode, then switch to the Music player and start a track, it comes out loud.
In a related note (so to speak), I'm very unclear on what the difference is between the slider at the top right (in JamUp, Amp/Fx tab) that slides right/left and the Volume knob on whatever amp I'm using. I expected that the slider at the top would be the input gain and the Volume be the amp's Volume (understanding that the SVT Volume really is an input gain also). The point being, I expected those two things to be separate and unrelated. However, to try and get usable volume from my physical amp, I've tried sliding the slider at the top as far to the right as I can, to where the bass input starts making it clip and sounding nasty. Then, I turned up the Volume itself all the way.
And, like I said, when I do this using my in-ears, I can hear everything okay. But, on my physical amp, the backing track is loud and the bass is still too soft. And this happens with JamUp and the AmpKit Link and it's basically the same with the iRig and using Amplitube.
Help?