Obscure alternative fingering?

[Ivan]

Playing my Bauhaus low A baritone today I found that engaging the side C key whilst playing F2 drops the note to a reasonably tuned C2. The jump is so stable I can trill from note to note using the side C as easily as trilling B to C with that lever

Also playing F1 brings the note up to C2 though with less stability

I don't recall seeing this fingering described and a quick comparison on a curvy soprano yielded squeaks

Is F2 + side C a known alt fingering? Or is this a quirk of that particular horn

 

[lydian]

It is not. Sounds like it would require some gymnastics to move your right hand up to play side C while keeping your right index finger on F.

I'd classify your find as a "false" fingering.

 

[Colin the Bear]

I've not come across it either.
I just tried it on SATB. Easier than it sounds on the hands but nothing stable soundwise.

 

[Ivan]

It is not. Sounds like it would require some gymnastics to move your right hand up to play side C while keeping your right index finger on F.

I'd classify your find as a "false" fingering.

Somewhere between alternative and false.... The C lever produces a good C after all

As for gymnastics... It's an easy manoeuvre, variations of which I use anyway for some altissimo notes... But then again short fingers, which I don't have, might increase the difficulty

 

[Pete Thomas]

The side C opens the alternative C key. So that is the effective length of the tube and more or less any other key pressed below will still result in a C so fingering A, G , F , E will always produce a C.

Whether it's good C may depend on the actual horn and there are some very slight differences as the lower keys do still have some small effect. Slightly flatter which may be a good thing.

 

[lydian]

Somewhere between alternative and false.... The C lever produces a good C after all

As for gymnastics... It's an easy manoeuvre, variations of which I use anyway for some altissimo notes... But then again short fingers, which I don't have, might increase the difficulty

Yeah, just tried it myself. Easier to reach than I thought. Results in a slight timbre change for me on sop/alto/c-mel/tenor/bari/bass, no change in pitch. Very subtle effect which I will probably never use. My go-to wah-wah effect for C is to close RH1,2, using regular C fingering.