These offer different sonorities, chord voicings, and fingerings. It is a MIDI sax offering real sax fingerings and a standard sax embouchure. Using alternate fingerings and adjusting the embouchure helps correct the pitch of these notes. These give the player alternative fingerings that make it easy to play ornaments and trills. These keys provided for simple chromatic fingerings. On many woodwind instruments, alternate fingerings are used. Forked fingerings may also be used to produce microtonal variations in pitch. This extends the low range and provides alternate fingerings and improved intonation for some notes. Special fingerings may be used to play quarter tones and other microtonal intervals. Forked fingerings allow recorder players to obtain fine gradations in pitch and timbre. The system combines the bore characteristics of Oehler system clarinets with Boehm fingerings. It has a simplified fingering system, lacking some of the trill keys and alternative fingerings. Various makers employ different scales and fingerings for their flutes. Woodwind instruments may use "false fingerings" to produce the effect. As a result, chromatic fingerings are difficult, and require extensive half-holing.