[DECtalk] singing the word higher while sliding

[Paul Balfe]

i am making a song and dt is having a problem with the singing of the higher while sliding i thought it would be the following.
hx<100,11>aa<300,11>aa<70,12>ay<400,11>yxrr<700,9>
when i put that in there it says error in phoneme.  any suggestions?
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