Discuss Studio 2|4 / 24c, 2|6 / 26c, 6|8 / 68c, 18|10 / 1810c, and 18|24 / 1824c USB 2.0 Interfaces Here
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Here is the wording from the manual - It's confusing the way it's written.

Input Source. Channels 1 and 2 offer an input source selection button that lets you
switch between instrument- and line-level on the ¼-inch inputs for these two
channels. Press this button to disengage the instrument preamp when connecting
line-level devices. When the button is illuminated, the input will accept a line-level
source, such as a synthesizer or guitar amp modeler. Press this button to engage the
instrument preamp when connecting guitars or a passive bass.


A. Since a guitar is instrument level, should the button be pressed in (illuminated) or pressed out (not illuminated)?

B. Is this correct?

Illuminated = line
Dark = instrument

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by themaartian on Fri Feb 09, 2024 3:17 am
bill0287 wroteHere is the wording from the manual - It's confusing the way it's written.

Input Source. Channels 1 and 2 offer an input source selection button that lets you
switch between instrument- and line-level on the ¼-inch inputs for these two
channels. Press this button to disengage the instrument preamp when connecting
line-level devices. When the button is illuminated, the input will accept a line-level
source, such as a synthesizer or guitar amp modeler. Press this button to engage the
instrument preamp when connecting guitars or a passive bass.


A. Since a guitar is instrument level, should the button be pressed in (illuminated) or pressed out (not illuminated)?

B. Is this correct?

Illuminated = line
Dark = instrument

Your "B" is correct. The button on my 1810c is labeled "Line". Illuminated is for Line level. Dark is for Instrument level.

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by SwitchBack on Fri Feb 09, 2024 3:45 am
bill0287 wroteWhen the button is illuminated, the input will accept a line-level source, such as a synthesizer or guitar amp modeler. Press this button to engage the instrument preamp when connecting guitars or a passive bass.
A. This probably should read as: When the button is illuminated [...] press this button [again] to [re-]engage the instrument preamp when connecting guitars or a passive bass. The current wording is kinda in the middle ;)

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