PreSonus BlueTube DP - Manual (Page 9)

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signal that you’ll need.
Tube Drive. The BLUETUBE DP Tube Drive control increases the
amount of saturation produced by the 12AX7 vacuum tube. The Tube
Drive can be turned on or off, and the effect achieved by this procedure
can be subtle to extreme, depending on the setting being used. A
“warming up” of the sound can be noticed with lower Tube Drive settings.
This desirable effect is especially good for microphones and electric bass
guitar, resulting in a warmer, “rounder” sound. An overdriven signal can
be achieved by significantly raising the level of the Tube Drive control.
This overdriven tube effect is extremely useful in creating vintage guitar
sounds and great for use with harmonicas for that authentic “Blues harp”
sound. The limits on the possibilities of the Tube Drive control are up to
you, your application, and your imagination. Experiment!