App

• Download v1.0.0-alpha
• Watch Demo

Source Code

• SignalLib
• UI Layer

Changelogs

• 12-6-2021 (v1.0.0-alpha):
  • Finally at version 1.0.0-alpha! Nearing official release. Please note that:
    1. Because I went back to college, it has been a while since the last changelog.
    2. There are not many new features with this build - the majority of the time was spent on improving the underlying code architecture to have a more stable foundation.
    • Many, many minor bugs were introduced and squashed along the way. Most of these will not be mentioned
  • Fixed Bug: clicking noise when pressing note
  • Fixed Bug: popping noise when adjusting overtones/harmonic series
  • Added Feature: 2-way slider for scaling keyboard
  • Performance Improvement: Audio latency/input lag has been reduced, as the app now uses your phones native sample rate and buffer size
    • note: this may not improve latency on older phones
  • Known Issues:
    • Clicking noise when releasing keys
    • piano distorts when scaling above 3 octaves
• 8-27-2021:
  • Fixed Bug: audio stuttering when playing 6+ notes
  • renamed wave shapes to their abbreviations (sin, sqr, tri, saw) so that they fit in one line
• 8-27-2021:
  • Added Feature: Waveform selector.
    • You can now choose between Sine, Triangle, Sawtooth, and Square waves
  • Audio stuttering issue alleviated
    • Previously, pressing 4 notes would cause stuttering. Now the threshold is ~6 notes
  • UI layout now resizes based on phone orientation
  • On startup, the fundamental overtone is set to max volume
• 8-24-2021:
  • All UI components have been rebuilt from the ground up to fit into the new Jetpack Compose framework.
  • Added Feature: Piano can support any range of keys; it is no longer limited to one octave. User control for this will be added soon.
  • Added Feature: Harmonic Series Editor gives the user more control over their sound.
    • Sliders for controlling the volume of each overtone
    • Reset button (sets all sliders to zero)
    • Random button (adjusts sliders by randomly changing parameters decay, floor, ceiling, and filter)
  • Added Feature: Pitch Bend
  • Added Feature: Signal preview
    • similar to realtime-audio viewer, but instead shows 4 periods of the signal you've generated with the Harmonic Series.
• 8-10-2021:
  • Added Feature: replaced noise effect with harmonic overtones
    • this is the first step towards additive synthesis. For now, the user can only change the harmonic range; the volume of each overtone exponentially decays automatically . However, under the hood, these overtones can be manipulated with more control, and this control will be given to the user in a later update.
  • Fixed Bug: all keys had to be released in order for changes from [-] and [+] buttons to apply
  • Fixed Bug: when holding two or more keys on the piano, releasing one key would cause all keys would release momentarily
  • Fixed Bug: audio visualizer was not properly centered and had a range of 0.0 to 2.0 rather than -1.0 to 1.0
  • Fixed Bug: generated audio was off-pitch
• 8-3-2021:
  • Added Feature: audio visualizer
  • Fixed Bug: noise level indicator to display incorrectly
• 8-2-2021:
  • Fixed Bug: excessive memory allocation that caused app to slow to a halt and even crash
    • this yields significant performance improvements
• 7-27-2021:
  • Added Feature: harmonic white-noise effect
• 7-25-2021:
  • Under the hood improvements which lessen the severity of the memory bug. This means that more notes can be played simultaneously without slowdown or crashing
  • Added Feature: the user can change the current octave