Changing the subject just a bit - has anyone tried tuning their 4th valve to low E instead of low F? My Willson 2704 can't get quite that far out with the current 4th valve slide. But the C and low F on that horn are both in reasonably good tune when played in 1 and 3. So it seems like having the 4th tuned to E would allow me to have a good low E and B without having to use the somewhat awkward 2 and 4 fingering. I talked to my local brass tech guy and it sounds like it wouldn't be that hard for him to make the change on that horn. Just curious. Thanks.