For Help: The SY77 must be in 'Multi-Mode', and be in 'Program Change DIRECT mode'.
To set into 'Multi- Mode' press the button labled 'Multi', to set to 'Program Change DIRECT', press 'Utility', choose 'Program Change', Press 'Enter', and using either the data entry slider or the '-1/NO', '+1/YES', select 'DIRECT'.