An .rx2 is a Propellerhead ReCycle loop: an IFF-style CAT group whose form type is REX2, holding big-endian chunks. ReCycle slices a drum or instrument loop into transient-aligned segments and stores the slice markers so a host can retrigger each and follow tempo. The markers hide in a nested CAT/SLCL group. Hover any field or byte to light its span and read the decode. Color marks kind (see the key).
An IFF CAT group, form type REX2, of big-endian chunks. The slice markers hide in a nested sub-group.
The group header, drawn above: the CAT keyword, the group size, and the REX2 form type.
Big-endian IFF chunks: a 4-byte id, a 4-byte size, then the body (padded to even). acidcat decodes the legible strings and reports the rest as regions.
The transient slice markers do not sit at the top level: they live in a nested CAT group whose form is SLCL, one SLCE per slice. acidcat recurses into it to count slices; a flat top-level walk would miss them.