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An android accordion tuner with strobe and multiple notes. The Windows, Mac and the Linux version of this project are also on Github. The apk may be found on F-Droid.
Hold the phone/tablet near the instrument, play a note and observe the display. In portrait the app shows a scope with the input signal, a spectrum showing the processed signal, the main display with the note value, cents error, frequency error etc, a strobe display and a meter display showing the cents error. In landscape the app shows just the main display and the meter. There is a signal indicator in the action bar which is useful in landscape mode. Using the touch setting changes below causes a short notification message to pop up for a few seconds.
The app defaults to equal temperament and the key of C. 32 temperaments are available in the settings.
For all temperaments except for equal it is necessary to choose a key. If you don't understand why, you probably shouldn't be using anything other than equal temperament. See Musical temperament.
Touch the scope to add an input low pass filter to make it easier to tune bass reeds by removing harmonics. Touch again to remove it. Touch and hold to add a fundamental filter. Touch and hold again to remove it. The colours have been chosen both for clarity, and for that 'retro' look like a real piece of hardware.
Touch the spectrum to zoom in to the current note. The display can show up to eight reeds. Touch again to zoom back out. Touch and hold to add a downsampling feature to help with bass reeds. This may produce spurious results. Touch and hold again to remove.
Touch the display to lock the current results. Touch again to remove the lock. Display lock is not preserved if the screen is rotated. Touch and hold the display to switch between displaying the closest result to the reference note and up to eight results. This setting is not remembered the next time you use the app.
Touch the strobe to turn it on and off. The staff will display instead. Strobe colours are configurable in the settings. Touch and hold to change theme.
Touch the staff to turn it on and off. The strobe will display instead. Touch and hold to change theme. In landscape touch the staff to lock the current results.
The meter shows the cents error up to plus or minus 50 cents. Touch the meter to copy the results to the clipboard. Touch and hold to prevent the display turning itself off. Touch and hold again to allow the display to turn off. In landscape touch the meter to switch between the display and the staff.
The status bar shows the input sample rate and the status of the various settings.
All the settings are preserved except the multiple note option and will be remembered the next time you use the app.
The input source may be changed. If a source that isn't present on the device is selected an error message will appear. Select the default source or the microphone. In theory you could use this feature to tune an instrument at the other end of a phone call.
The audio filter item controls a low pass filter in the audio input before processing.
The downsample item controls a downsampling feature on the audio input during processing to help with bass reeds. Use with caution, it may generate spurious results
The screen item stops the screen turning itself off.
The spectrum zoom item controls the zoom feature of the spectrum display.
The multiple notes item controls the display of more than one result on the display. This setting is not preserved.
The fundamental filter item enables the fundamental filter.
The note filters item enables the note and octave filters.
Pick which notes you would like to appear in the display.
Pick which octaves you would like to appear in the display.
The strobe item controls the strobe display.
If the strobe is enabled, there is an option to change the colours. There are three predefined settings and a custom setting. If the custom setting is selected the two colours may be changed individually. touch the outer coloured circle to select a colour. Touch the centre coloured circle for each colour to see what it will look like on the left.
The reference frequency for 'A' may be changed over a limited range. This will be remembered, so change it back to 440Hz before you quit the app.
The transpose item allows transposition of the note display. This will be remembered, so change it back if no longer required.
The dark theme item allows use of the dark theme.
The about item shows the copyright and licence.