You can chain Matroska files into other files by using chapter references. For example, you can have an "seamless season" `.mkv` that plays the episodes of a series' season(s) without intros and outros as a single file by listing the "core" chapter IDs in sibling `.mkv` files in order. For audio, it is probably less useful unless you're cutting (typically) fiction podcasts into chapters with which to then do this. Or someone published chapter metadata for podcasts to cut out in situ ads. Alas, very few podcasts actually use chapters in the first place…