Hi Syntho.
In my experience, I've heard both the "Air noise" and "Ground tone", this is why I stated both possibilities, without clear description of the tone in question or a sample to refer to, I assess both possible cases.
anyway, as to your question of my use of IT and studio gear. with Mac OS9.2, I use a screen reader called OutSPOKEN 9.2 which is now impossible to get hold of. it's a screen reader which echos keyboard and mouse movements to speech, as well as all screen contents such as text, icons, etc.
on the intel mac I'm using to use this forum, it's voiceover in OS X yosemite, Voiceover is so much better in terms of navigation and gets me out of the sticky stuff.
with the G3 / ProTools TDM side of things, outspoken is a life saver so trying to rebuild a protools tdm setup for the studio is rather important, so I've a real challenge on my hands. in terms of gear control, I used to use logic platinum 6 along with sounddiver 3 but I can't get that software as a full kit anymore with the dongle. just can't find it for love nor money. at least with that particular midi environment using sound diver, outspoken gave me spoken data of everything a sound odule, effect processor (via midi) or synth, etc was doing, what I could edit, etc.
having found UniSyn 2, that might be a help, worth a try lol.
Everything I do is a process of tactile control and audio feedback, 14 years of being in studios, touring, installations etc has given me methods most sighted people don't dream of. but that gives me a hidden edge in my work.
anyway, re the 888 trim, tone generators are always useful things to have in your toolbox.
ed