I'm not a HA user either, though I played with it a long time ago. But I can think of two possible workarounds.
1. Transpose tunes in other keys to C before printing them. That is, in effect, the equivalent of translating fixed-Do solfège to moveable-Do. Your student can then read Do as the tonic of whatever key he/she is playing in.
2. The "Scat Jazz" feature of HA lets you assign arbitrary syllables to the pitches. Use a [scat:] directive to explicitly assign Tonic Solfa letters/syllables to each note of the chromatic scale, with the tonic of the key as d/Do. Not sure if the program allows you to print out the assigned scat syllables, though.
http://www.myriad-online.com/resources/ ... ckscat.htmGood luck!
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