Update alpha tester guide for the ninth alpha build

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mherbold

ALPHA-TESTING.md

@@ -19,13 +19,14 @@ This document explains what changed versus the released (main branch) version, a
 
 ## New in this build
 
-Changes since the seventh alpha (2.0.475.54), for testers who already ran it:
-
-- **Everything from released version 2.0.478.66 is now included.** Most notably the **six new game bridges** (Assetto Corsa, Assetto Corsa Competizione, Assetto Corsa EVO, Assetto Corsa Rally, rFactor 2, and RaceRoom Racing Experience), the **vJoy steering passthrough** for games that give you no way to turn off their built-in force feedback, the game bridge safety warning, and the fix for sounds not playing after the audio output device reopens. The new bridges get the same FFB graph engine wiring Le Mans Ultimate already had — reconstructed physical wheel angle for the soft lock / wheel centering / prediction inputs, and the car's redline and engine state for the engine RPM vibration.
-- **New 60 Hz prediction module.** The prediction lineup is now two modules: the existing one is renamed **360 Hz prediction**, and the new **60 Hz prediction** is built for the 60 Hz source. At 60 Hz the torque history alone carries almost no predictive power, so this module learns from your steering and the car's chassis motion instead, runs once per telemetry frame, and holds its correction across the frame. Defaults: 33.3 ms horizon, 100% strength, 5 Nm limit. See [the math](#inside-the-prediction-modules-the-math).
-- **Prediction horizons are now in milliseconds.** Both prediction modules show and directly edit their Horizon in ms (previously the 360 Hz module counted K1–K12 ticks).
-- **Marvin's built-in graphs now include prediction out of the box** — Marvin's easy detail adjustment carries the 360 Hz prediction module, and Marvin's native 60 Hz carries the new 60 Hz one.
-- **Strength settings are now stored in Nm instead of %.** Every fixed-amplitude strength — all the vibration generators, the understeer/oversteer/seat-of-pants forces, the friction source, and the torque dither — is now a direct torque value in Nm at the wheel. The value no longer changes meaning when you change the wheel force setting, and a shared graph feels the same on a different wheelbase. Gain-like strengths (wheel centering, soft lock, wheel velocity, LFE, prediction) stay in %.
+Changes since the eighth alpha (2.0.478.83), for testers who already ran it:
+
+- **Every node now has a description.** Each module type ships a built-in description (translated into all languages), shown below the module's settings and as the node's hover tooltip in the graph editor. On custom graphs you can edit each node's description — and the graph's own description — in a multi-line editor window (the pencil buttons).
+- **Pinned settings got a face-lift.** The pin control is now a pin-shaped icon right next to each setting's name — gray when unpinned, MAIRA orange and pushed in when pinned. A node's Enabled toggle is pinnable too (the pin next to the node name), so a whole effect's on/off switch can live in the quick controls. The quick controls are grouped by node with the node's name and description, and a new "Show pinned settings" switch tucks the whole area away.
+- **Strength settings are now stored in Nm instead of %.** Every fixed-amplitude strength — all the vibration generators, the understeer/oversteer/seat-of-pants forces, the friction source, and the torque dither — is now a direct torque value in Nm at the wheel. The value no longer changes meaning when you change the wheel force setting, and a shared graph feels the same on a different wheelbase. Gain-like strengths (wheel centering, soft lock, wheel velocity, LFE, prediction) stay in %. **Existing custom graphs and saved values are read as Nm without conversion** — expect to re-tune strengths (the old 0.05 now means 0.05 Nm).
+- **New A/B switch mixer node.** Passes either input A or input B straight through, chosen by a switch — build two candidate signal chains and flip between them instantly to compare how they feel. Map the switch to a wheel button for hands-on-wheel comparison.
+- **Module switches and node enable toggles are now input-mappable.** Right-click any module switch (or a node's enable checkbox) to bind controller buttons to it, exactly like the module knobs.
+- **Editor refinements.** A newly added node now splices onto the wire between the selected node and its first downstream node, sliding the downstream chain aside to make room; the prediction horizons display with one decimal place (16.7 ms, not 17); and the pinned-group divider line no longer vanishes at app UI scales below 100%.
 
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