I was rehearsing with my band today in a rehearsal studio and had my 80's MIJ strat plugged into a twin reverb. When I stopped playing I noticed that I could hear the vocals from another band, who were rehearsing down the hall, coming through the amp. When I turned my guitar volume down it dissappeared. I deduced from this that my pickups were picking up the signal from their microphones. Surely that's not normal. Is that what's meant by the term 'microphonic'? Is this something that all strat pickups suffer from or just mine?