Oehler system

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The Oehler system (also spelled Öhler) is a system for clarinet keys developed by Oskar Oehler. Based on the Müller system clarinet, the system adds tone holes to correct intonation and acoustic deficiencies, notably of the alternately-fingered notes B♭ and F. The system has more keys than the Böhm system, up to 27 in the Voll-Oehler system (full Oehler system). It also has a narrower bore and a longer, narrower mouthpiece leading to a slightly different sound. It is used mostly in Germany and Austria. Major developments include the patent C♯, low E-F correction, fork-F/B♭ correction and fork B♭ correction. Fingering charts can be found for example in this reference.^[1]

In the case of finger systems for the clarinet, which are based on the Oehler system, one speaks today mostly of the German system, and of finger systems that are based on the Boehm system (clarinet), of the French system.