Author: Chris P
Date: 2017-03-27 23:45
The three main systems (thumbplate, ring key conservatoire and plateaux/Gillet conservatoire) each have their own different fingerings for the Ab-Bb (G#-A#) trill.
On pure thumbplate systems (Howarth S1/S2/S10/S20/B model, W&W TW1/TW2/TW3, B&H Regent/Emperor/Imperial, Orsi/Prestini/Louis LM5/Selmer Sterling and other Italian imports) you'd play Ab (G#) and trill with the side key for the Bb. While I haven't tried it, the side key may also give a high F# (in addition to the standard altissimo F fingering, just as adding the side Bb key does on saxes).
On ring key conservatoire systems (Howarth S3, conservatoire system B&H Emperor/Imperial, older German oboes. etc.) you'd play Ab (G#) and trill with the upper side key for the Bb. The side Bb key on these oboes also doubles as a high F# key (as does the side Bb key on saxes).
On plateaux or Gillet conservatoire systems that have the Ab-Bb trill linkage fitted (the small piece of linkage connecting the G# key to the LH2 fingerplate), you'd play Ab (G#) and trill with LH finger 2.
An upper register A#-B (Bb-B/Bb-Cb) trill can be done on thumbplate/dual system oboes with the usual thumbplate fingering for Bb (A#) and trilling with RH fingers 1 and 2 together - adding RH 1 and 2 will give a harmonic fingering for high B (8ve2, thumb off thumbplate, xxo|xxo). On conservatoire systems using the conservatoire fingering for Bb (A#), trill with RH finger 2 for the B.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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