Big Joe, According to the V-Type operating instructions manual, it "shifts the centre frequency at which the mid control works at, upwards to around 2kHz." The unengaged position (pushed in) gives a slight mid cut at about 1kHz. I typically use the engaged position and it sounds great. I hope this helps. BlountEdge
Use both.....in and out. The Vtype happens to be my favorite preamp and recording DI at the moment. I find it quite noticeable , when pulling the midshift on. I recommend sending it off . Mine is going in for a overhaul shortly. I have noticed some problems. Thanks Robert VanLane