I've been working on a library for manipulating transducers with arbitrary numbers of tapes. This page is to collect uses of such transducers.
Feel free to add more.
Modeling sound changes
Old English → Middle English
<firespeaker> so like, if you think about OE→ME→ModE changes <popcorndude> well, as of today I can probably apply such rules <popcorndude> (though I can't compile them yet) <firespeaker> gɔːs>i:gɔːsi <firespeaker> gɔːs>i:gœːsi <firespeaker> gœːs>i:gœːsə <firespeaker> gœːs:gœːs <firespeaker> geːs:geːs <firespeaker> giːs:giːs <firespeaker> I think you get from OE to ModE with these stages, but you'd want to check the details <firespeaker> some of them refer to :SR, I don't think any need to refer to UR: though <firespeaker> (the last few stages can be either, it's pretty straightforward at that point) <popcorndude> if you had a segmentation tape you could write a rule for reanalysis <firespeaker> right <firespeaker> the UR:SR forms I gave are the two sides of twol <firespeaker> UR has the segmentation <firespeaker> it'd be good to have a morph tape too
Arabic loanwords in Kyrgyz
<firespeaker> popcorndude: remind me later to tell you about ɑw→oː coalescence and reharmonisation in Kyrgyz words of Arabic origin <firespeaker> (I'm a bit busy now) <popcorndude> ok <firespeaker> short set of data: *molla → moldo, *hoʤa → qoʤo, but *sawda → soːdɑ and *ʃa`ula → ʃoːlɑ <firespeaker> and unborrowed data: *tɑw → toː, etc. <firespeaker> I have some thoughts on how to model it that would benefit from an n-tape transducer <firespeaker> oh and another important pieces of unborrowed data: *sawlɑn → soːron <firespeaker> *piece <firespeaker> https://ibb.co/GCwDHCP <firespeaker> my thoughts are near the end of the paragraph
<firespeaker> another good example: Kazakh /ɑ/ fronting between palatals versus the phonologisation of what appears to have been exactly the same thing in Tatar
<firespeaker> popcorndude: another use case for n-level transducers: having a morphological level available for transcriber transducer rules
Also having a segmentation tape. Or a tape corresponding to each line of a gloss.