“weak” sound can happen for a few reasons but i’m not sure it’s lack of volume here… The digital conversion can suck the perceived ‘body’ out of some types of raw analogue sampled sounds, especially midbass it seems. I thought this was more of a problem with the machinedrum sound when mixed with an all analogue kit but it’s actually an issue when analogue mixing of digital and analogue instruments generally. The OT has an airy quality that can sound great with an external pre-EQ, tube or solid state really helps to give some life back to the sterile, flavourless OT chip amplifiers. At the moment I’m using a Studer fixed EQ channel strip with nice old transformer inputs to help give the OT a more controlled, powerful tone generally, works a treat.