A Saturation in the graph was a stack of rows. The user wanted a device of its own style and size, like the Delay and the Reverb, that shows warmth and heat the harder the sound is driven. - The node is a copper plate of 720x280 with a button per type, the auto-gain lever, a big drive knob and small knobs for tone, output and wet. Each change is one undo step, wired numbers lock their knob. - The screen draws a sine at -12 dBFS, the level auto-gain is reckoned at, as a grey ghost. Over it is the wave that comes out: bent by the type, its DC taken out, auto-gain and output after it, blended by wet. Under it stand the auto-gain and the peak. - The heat is the drive over 48 dB, as far as wet lets it be heard. The wave goes from cold steel through ember red to white, a glow rises from below and flickers, and embers fly up from about 8 dB on. A lamp beside the name glows with it. - The node keeps the editor drawing only while there is heat. Without drive it draws nothing, unlike the Delay, which always animates. - The Reverb's private type button is now PickButton with its own colours, and the Saturation's type buttons use it as well. - No instrument preset uses a Saturation, so no preset needs more columns. Tests: - Unit saturation-view: 14 new tests. - Counter-check: without taking out the DC, exactly the DC test fails. - e2e 34 (atx): ALL PASSED, 137 checks, one new for type, lever and drive with undo. - Gate (atx): CHECK EXIT 0, 289 files, 4431 tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>