Situation:

You recorded a nice sample from an external source (name it a bass synthesizer or anything else). After recording you see that the sample’s gain is too low.

Solution 1:

• copy that pattern from the pattern view to the arrangement view
• consolidate that sample in the arrangement view (CTRL+ J on Windows or CMD + J on Apple)
• increase the sample’s own gain to 0dB
• the tiny downside: bass samples get often distorted. If you don’t like auto-distortion take Solution 2 ;-)

Solution 2:

• get yourself Audacity
• load that recorded sample from Ableton into Audacity
• go to Effects -> Normalize
• et voilà: gain set to 0dB and no distortion

Enjoy…