Ok so on the manual on my m pulse it says the mid control is boost only but it also says that its a passive control. So this seems a bit confusing. I've always thought that passive controls can only be cut ie when it's up full the output is 0dB anything below that becomes minus X amount of dB's depending on how far its rolled back. Also passive to me also means no power supply and if I remmber correctly you need a power supply of some sort to boost by x amount of dB's above the input signal level I read somewhere else here on talkbass that a walkabout or m pulse owner confirmed with mesa that this control is boost only and is passive. So could someone please explain.