￥BaB Drive simulates the sound of analog tape and the classic tubes (triode, tetrode) in most of the popular DAWs

 

Drive A changes the signal’s fundamental frequencies so when it’s on CW the signal will be distorted(Bias).
Drive B will make an equal (operating level) and even&odd harmonics. Should you want to add more depth, warmth and presence turn CW the Drive A.
The Amount switch will attenuate the warmth.