Methodox Virtual Keyboard puts two to six octaves of piano and twenty drum pads on screen, then puts all of them under keys you already have. Every note is synthesized while you hold it, about 10–12 ms after the key goes down.
Windows today. macOS and Linux are coming.
This is the part most on-screen keyboards skip. You are not clicking one note at a time with a mouse — you are playing with ten fingers on a keyboard built for ten fingers. Q W E R T Y U is the lowest octave's seven white notes, A S D F G H J the middle octave's, Z X C V B N M the highest: pitch rises as you read down the keyboard. The number row and the numpad are the twenty drums. Everything else is transport.
The drum kit is not a separate mode you switch into. It sits with the keys and plays at the same time as them. The number row fires the top ten, left to right; the numpad fires the bottom ten — or Shift and a digit, if your keyboard has no numpad. Each pad is striped with its percussion family, the same colours the app uses.
Twenty pads on the desktop. The phone edition carries eight, played with your fingers.
One selector changes what the instrument is. The controls beside it change how hard it is being played, how loud it is, whether notes hang on, and how much room is around them.
Three settings for how firmly the instrument is being struck. Pick one and the whole performance sits at that weight.
Keys and drums together, on a single control.
Notes keep ringing after the key comes up. Toggle it in the controls, or hold Space while you play.
Add a tail to the sound, or take it away and hear the instrument dry.
The sound comes from SoundFont synthesis. The note is generated for as long as you hold the key, which is why notes overlap, ring on and decay the way an instrument does instead of cutting off wherever a recording ended.
The desktop edition is the whole instrument. The phone edition is the part of it that fits in your hands.
The flagship. Built for a computer keyboard and a wide window.
The companion. Turn the phone sideways and play it with your fingers.
No project to create, no first-run setup, no instrument to load. The keys are there when the window opens.