Hi Walker,
Unfortunately the VisualAudio tools are no longer supported by ADI. The correct support route for questions regarding VisualAudio is now through the engineers at DSP Concepts,
http://www.dspconcepts.com/contact
A C code from the internet may not work directly on the SHARC processors . In SHARC processors ,all the data types are of 32 bits in length . So user has to make suitable changes in the code to make it work .
The more appropriate source for the Pitch shift algorithm will be the VDSP++ Example codes for the ADSP-21161 processor which can be found in the following path
Analog Devices\VisualDSP 5.0\211xx\Examples\ADSP-21161 EZ-KIT Lite\Digital_Audio_Effects\Pitch_Shifter .
You can use this as reference for your ADSP-21369 code .
Regards,
Mahesh