Ambi Transform Order Band 64

s3g Ambi Transform Order Band 64 is a fixed 64-in/64-out ACN/SN3D utility for trimming ambisonic orders and applying common order-weighting curves. It is useful before a decoder, before a stereo/head monitor, or between ambisonic effects.

Ambi Transform Order Band interface showing MaxRE weighting across all eight order bands — Ambi Transform Order Band with full-strength `MaxRE` weighting across `0OA`–`7OA`.

Workflow

Insert s3g Ambi Transform Order Band 64 on a correctly routed 64-channel Ambisonic track and set ORD to match the source.
Follow it with an ambisonic decoder.
Begin with Flat weighting and unity order trims.
Choose a weighting curve or adjust complete order bands while comparing localization, diffuse energy, and decoder stability.

Model

Ambisonic channels are grouped by order. Order 0 is the omnidirectional component. Higher orders carry progressively finer directional detail. This plugin scales whole order bands rather than individual channels, so the spatial format stays coherent.

The order map in the GUI shows the resulting order gain after the selected weighting preset, weighting amount, and per-order trims are combined.

Controls

Control	Meaning
ORD	Active ambisonic order, from `1OA` to `7OA`. Channels above the selected order are muted.
WGT	Weighting preset. `Flat` leaves orders level, `MaxRE` applies max-rE-style order weighting, `In-phase` applies a more conservative taper, and `Custom` uses only the order trims.
AMT	Weighting amount. At `0%`, only per-order trims are heard. At `100%`, the selected preset is fully applied.
O0–O7	Per-order gain trims. These are useful for comparing localization, diffuse energy, and decoder stability.
OUT	Final output gain.

Weighting Guide

Flat: best for checking whether a chain passes the original ambisonic signal without extra order shaping.
MaxRE: a useful default before speaker decoding when localization should remain clear without pushing the highest orders too hard.
In-phase: useful when the layout is irregular, the decoder feels too sharp, or a safer diffuse field is more important than tight localization.
Custom: use the order sliders as a manual spectral/spatial tilt across ambisonic order bands.

Routing

The plugin exposes one 64-channel input bus and one 64-channel output bus. Unused lanes are cleared. Keep it on a 64-channel REAPER track when using it in a 7OA-capable chain.