The Q175A MIDI Interface Aid module operates in conjunction with the Q174 MIDI Interface module to provide additional Pitch/Gate outputs, an Arpeggiator and Portamento (glide between notes).
The Q175A does not have the MIDI functions of the standard Q175. Pitch and Gate multiples are provided instead. This can save space in smaller systems by eliminating the need for an extra multiples module.
The Arpeggiator automatically cycles through notes that are held down. The operator has complete control over the cycling rate using the manual speed control, or it can be driven from an external clock to synchronize with sequencers and other devices. The manual Gate Width control determines the length of each note, or it can be controlled by the width of the pulse at the Clock input. Direction of the pattern can be selected Up, Down or Up/Down, and changed in real-time. The pattern can include just the notes being held, or those notes plus the next octave up.
Portamento (Glide) provides a gradual transition between notes as they change. Speed of the glide can be controlled manually as well as the curve type - Linear or Exponential.