User`s manual

The USB Out connector is USB 1.1 compliant and should be used to connect directly to one of the

USB inputs on your computer. This connection also powers the USB circuitry inside the Tube MP

Project Series with USB. To your computer this connection looks like a “USB Audio CODEC” and

your computer then controls the sample rate and whether the signal looks like a mono or stereo

signal to your recording application software.

Since the USB connection will be carrying high quality digital audio to your computer as well as bus

powering the USB interface, we suggest that you use a high quality shielded USB cable for best

performance. Ideally you should connect directly to one of the USB inputs on your computer. Con-

necting through a shared hub can reduce power and bandwidth that is available for each USB device

and should be avoided when possible. Though the Tube MP Project Series with USB is compatible

with USB 1.1 and 2.0, USB 2.0 is preferred for the cabling and computer connection as it allows for

more bandwidth. If you must use a hub, it should be a powered USB 2.0 compliant hub for best

results, This is especially important if you plan on using multiple units for more channels of simulta-

neous digital audio input.

Both analog output jacks and the USB Out can be used at the same time, which is handy when you

want to run to a mixer and your instrument amp in a live situation, or when connecting to a computer

or recording system and locally monitoring your source. Though the two analog output signals are

isolated they do share a common ground so care should be used to make sure that you don’t create a

ground loop in your system.

For a typical recording application where you want to add tracks of audio using the USB bus to your

computer, while monitoring the mix externally for low latency, we suggest the following: Connect your

instrument or microphone to the Tube MP Project Series with USB, then connect to your computer

with a USB cable, next connect the audio output from your computer to a small monitor mixer. Also

connect one of the Tube MP Project Series with USB analog output jacks to the mixer and monitor

the analog mix of the 2 signals from the mixer. In this case the new track that you are recording will

be in real time and have no latency in your monitoring system.