Quick Reference

RModX is a MacOSX port of an older SGI/IRIX app called RingMod, with the following differences in functionality:

• Input/output port cannot be chosen within the application, nor changed during application runtime, but has to be done through System Preferences and/or Audio MIDI Setup before launching the app.
• Audio Buffer size cannot be set programatically, but through System Preferences and/or Audio MIDI Setup.
• It doesn't utilize X11 window interface but Apple native Cocoa.

Basic usage reference:

• Hooks to the default inupt/default output, whichever chosen as such
• Sine, sawtooth and triangle carrier waveforms
• Convolution and diode signal processing modes
• Self-modulation
• Carrier frequency control, through GUI or MIDI keyboard
• Modulation depth control (left-hand slider)
• Non-linearity control in diode-mode (right-hand slider)
• Full phase-increment, amplitude-increment and depth increment integration
• Sample-accurate control rates
• 32-bit floating-point signal format, 64-bit DSP
• Master tuning: 435-445 Hz
• Interface hints:
  • Stepper changes Master Tuning in 1 Hz steps
  • Scale buttons multiply carrier frequency
  • Clicking the display on value centers carrier frequency - showing Master Tuning
  • Clicking the display on "Hz" tag toggles linear/logarithmic interface behaviour
  • Convolution/diode button toggles proces mode
  • MIDI button toggles control mode
  • Left-hand slider or mod wheel (CC01) control modulation depth
  • Expression control (CC11) controls non-linearity
  • Pitch wheel bends carrier frequency
  • MIDI Channel pop-up under the MIDI button selects active channel
  • Level indicator beneath the convolution/diode toggle indicates input signal
  • Keybord Shortcuts:
    • Mute: cmd-M
    • Bypass: cmd-B
    • MIDI/GUI toggle: opt-M
    • Convolution/Diode toggle: opt-D
    • Center Frequency: opt-C

Everything else is pretty much self-explanatory.
This is an exercise in writing a performance oriented sound app, using no-latency design. Therefore it will work only on full-duplex audio hardware (capable of simultanous synchronous playback and recording), such as RME Fireface or M-Audio Audiophile 24/96, and luckily, many more nowadays. Else it will display error messages and quit.
If you'd like to try it on the built-in (non full-duplex) audio, you may have to download and install a software aggregate device, such as Cycling74 Soundflower.

There are still a couple of rough details waiting to be polished. Hope to have the complete version of the program with source-code posted soon.

FAQ:
Why standalone?

• Because it's the cleanest, minimalistic method for achieving no latency.
• Because it is designed to be a standalone concert instrument, not a plug-in.