Game aid
A game aid is a device on musical instruments that triggers special functions or changes preset sound parameters.
organ
With an organ one of the playing aids is:
- Coupling and coupling manuals
- Swell box
- Registration aids:
- fixed and free combinations
- Register sill (also called roller , roll sill or crescendo step)
- other registration aids such as register shackles , typesetters and holders
Furthermore, sometimes even elements of the key action , referred mainly serve to reduce the forces to be applied to operate a Tonventiles as play help. These are parts such as the Barker lever , pilot valve or balancer .
Electronic keyboard instruments
An electronic keyboard instruments , a place often pitch bender , a modulation wheel , slider (English Slider called), holding - and volume pedals .