What's new in 0.37.0

Measure a speaker with a microphone. For a Bluetooth speaker or a car, the device tab can play a set of tones, listen with the microphone from three spots around where you sit, and save a gentle correction as a preset that loads whenever that speaker connects. It cuts peaks by up to 12 dB, lifts dips by no more than 4 dB, and leaves alone what the speaker can't really play. A USB measurement microphone is used when one is plugged in. Nothing is recorded or kept: only each tone's level is read.
The version now shows beside the app's name at the top, so it's clear which build is running.
The spectrum's info button sits clear of the panel's edge, centred over the dB labels.

Everything since 0.33.0

Measure a speaker with a microphone. For a Bluetooth speaker or a car, the device tab can play a set of tones, listen with the microphone from three spots around where you sit, and save a gentle correction as a preset that loads whenever that speaker connects. It cuts peaks by up to 12 dB, lifts dips by no more than 4 dB, and leaves alone what the speaker can't really play. A USB measurement microphone is used when one is plugged in. Nothing is recorded or kept: only each tone's level is read.
The version now shows beside the app's name at the top, so it's clear which build is running.
The spectrum's info button sits clear of the panel's edge, centred over the dB labels.

New filter types: tilt, notch and band pass.
Slopes for high and low pass, from a gentle 6 to a steep 48 dB per octave. Existing filters stay at 12, so presets sound the same.
Left, right or both: each parametric filter can shape one channel only, for headphones whose sides differ.
Dynamic filters: a bell or shelf can also turn its range down while it gets loud, like a compressor for just that part of the sound.
A tab for what's playing, named and drawn for it: Phone, Headphones, Earbuds, Speaker or Car. It animates when the device changes, and its page offers what suits that device.
Output level meter beside the spectrum, which turns red when peaks reach full scale. Tap it to read about it.
Discarding changes no longer leaves the filter editor empty.
Filter type names no longer get cut off.

The graphic EQ faders show the whole sound. Picking a preset moves them to its curve, so each fader reads the real dB at its band. Only your difference from the preset is saved, so presets sound exactly as before.
Reset puts the faders back on the preset's curve.
Where a preset cuts deeper than a fader reaches, the fader rests at the bottom and the readout gives the real figure.

The code uses the Eigentone name throughout, with the package io.github.dragjon.eigentone.
After updating from 0.33.0 or earlier: add the Quick Settings tile and home-screen widget again, grant notification access again if you use per-app presets, and re-pin preset shortcuts. Your presets and settings are kept.
Share codes from before the name change no longer work. Share the preset again for a new code.
"Report a problem" in Settings fits on one line.