I appreciate reading everyone's opinion of what works for them. Frankly, that is one of the main purposes of this forum. With that said, in my opinion, I don't think hitting deep silver depends on the number of audio sounds (or lack there-of) as much as it depends on the sweep speed and controlling the direction of the sweeps. But here are the reasons I like to hear all the information I can. In the all metal - multiple tone mode, I hear an audio response from every target that the coil passes over. 28 different tones representing targets from each of the 28 notch segments. In a Pattern mode, the Threshold goes away, and I hear a nulling (no sound) when the coil passes over any target (or targets) being discriminated out. If you are using Pattern One (default settings) you lose all sound as the coil passes over any target or targets with a TID of 48, -2, -4, -6 or -8. That silence sounds the same no matter what the TID value is of the rejected target or targets. By hearing both "bad signals" and "good signals", I can determine when there are multiple adjacent "bad" targets. If all I got was silence as the coil passed over all the "bad targets" (regardless of what rejected notch segment they were represented by), I might not be able to determine just how many "bad targets" were adjacent to the good target. By knowing the number of and location of those "bad" targets, I can control my sweep to better isolate the keepers.
If hearing all those sounds becomes overwhelming to the point it is confusing, then using a Pattern where you hear "nothing" on rejected targets (instead of a variety of low tones), might be the best way to go. But keep in mind that those longer "nulling" periods could represent multiple rejected targets surrounding a "deep keeper". By utilizing the all metal - multiple tone mode, I hear everything under the coil and I let my ears sort out what to dig and what to leave behind. But again, that is just my opinion. Whatever works best for you is what you should stick to! For those who are still undecided, I'd suggest laying out some coins and trash, (vary the distance between each target), try both methods, and see how the target separation compares between Pattern mode and all metal - with multiple tones. HH Randy