From CockosWiki

This page describes the Param button which is at the top of each REAPER and Jesonic effect.

Use your browser's Back button to return to the Effect page when you're finished here.

Contents 1 Param 1.1 Initial Menu - no FX Parameters have been touched 1.2 Parameter modulation 1.3 Initial Menu - FX Parameters have been touched

Param

Initial Menu - no FX Parameters have been touched

If no FX Parameters have been touched, a menu similar to this will show.

Choosing an option from the second menu will show a list of FX parameters

• • Show in track controls - Choosing a parameter will show it in the TCP
  • Show track envelope - Choosing a parameter will show the envelope for that parameter in its own lane - under the main track lane.

Parameter modulation

• • Parameter modulation - Choosing a parameter will show a dialogue similar to this (this example is the Vol FX parameter):

• • • Enable param... ...overides) - Enables or disables parameter modulation, always subject to automation envelopes though.
    • Audio control signal
      • Source audio channel - Displays a drop down menu similar to this:

Choose an input channel option if you want the parameter to be modified by the amplitude (the changing volume) of the input signal.

• • • • Attack -
      • Release -
      • Strength -
      • Direction - Negative, Centred or Positive
    • LFO - Low Frequency Oscillator
      • Shape - Sine, Square, Saw, etc.
      • Tempo sync - Check this option to synchronise the LFO with the tempo of the song
      • Speed - The speed of the LFO, disabled if Tempo sync is checked.
      • Strength - The strength of the LFO, the amplitude of the waves
      • Direction - Negative, Centred or Positive
    • Audio control signal shaping
      • Curve Edit - Drag the focal point of the curve
    • Input dB
      • Minimum - Set the Minimum value
      • Maximum - Set the Maximum value

Initial Menu - FX Parameters have been touched

If, however, FX Parameters have been touched, a menu similar to this will show instead

You can see that in this example the FX parameter NoteStar (shortened from NoteStart) was the last touched - so the param button gives you some shortcuts; it saves you making that extra click into the 2nd menu if it's NoteStart you need to work with, and as that's the one you touched last it might well be.