The AsymMetronome is specifically designed for triple meters with unequal beat lengths (e.g., Norwegian Springar or Macedonian Lesnoto). This is a beta version. It is not finished, nor is it optimized for all mobile devices. An expanded version that will accommodate more beats and subdivisions, and expressive/swing timing is in development. If you have any helpful feedback or feature requests, feel free to contact me: code{at}wmich[dot]edu

 
The relative length for each beat can be typed directly in the Lengths textboxes in any units you want (e.g., 3_2_2, 7_15_11, 46_33_22, etc.).
Alternatively, you can tap the beat pattern with the Takt Tap button or click in the silver square and type with the spacebar or period. After tapping at least 4 full measures, the AsymMetronome will automatically calculate the beat proportions and overall tempo. If your pattern appears shifted on the wrong downbeat, Start/Stop the metronome and try again.
 

Start & Stop using the button or pressing the Enter key. By default, the beats are played with the same percussive sound for every beat. The Accents button makes each beat play with its own dynamic from a selection of four levels ( !!  >  •  . ) Clicking the Beeps button will substitute electronic beeps. Note: On some devices, at fast tempos the percussive sounds do not play properly. If this happens, switch to Beeps.
 

The tempo is based on the average of the three beats. In other words, at 60 bpm, each measure is three seconds long, but the individual beats might be 1 second, .7 seconds, and 1.3 seconds. The Flex option incorporates some fluctuation to the pulse. Range sets the upper- and lower-boundaries within which the tempo can vary. With a starting tempo of 120, a range of ±5 means the tempo could drift between 115 to 125. Step specifies the maximum number of ticks it could change from one beat to the next. Odds affects how how frequently a change might occur. Even the best performers do not keep mathematically precise tempos. As such, practice following a variable-speed metronome is a more realistic, less mechanical training experience.
 

The time signatures displayed are based on Key/Beat signatures. They are intended as quick visual representation of the overall pattern. The relative beat lengths are depicted as short (.), medium ( ), and long (–). Lengths that are within a few percentage points of each other are displayed with the same vlaue. If a beat is so short as to be less than half the length of another, it is depicted as an 8th note. This is not to dictate how a given piece of music must be rendered in written notation, but rather to provide a more helpful guide than simply using 3/4.
 

You can save the tempo and beat lengths as a customized URL and QR-code. Enter a brief Label and click Save. Paste the URL in an email or other document for future use. The QR-code could be included on sheet music as an audible time signature. Use the Popup button to open the QR Code in a new window. Note: the longer your label, the denser the QR-code will be. Also, the displayed percentages are rounded and thus might not always add up to 100%. These proportions might get rescaled when generating the QR-code, but the resulting pattern will be less than a half a percentage point different from the original: well within the margin of variation of human performance.