# Knob

An item for adjusting an Instrument's parameters.

### Description

A Knob is an Item for adjusting an Instrument's parameters.

### Folio

audio

### Item Type

AUDIO_KNOB_NODE

### Create

`CreateItem()`

`GrabKnob()`

### Delete

`DeleteItem()`

`ReleaseKnob()`

### Query

`GetAudioItemInfo()`

### Modify

None

### Use

`TweakKnob()`

`TweakRawKnob()`

### Tags

AF_TAG_CURRENT
  (int32) Query. Returns the current raw value of knob.

AF_TAG_DEFAULT
  (int32) Query. Returns the default raw value of knob.

AF_TAG_INSTRUMENT
  (Item) Create. Specifies from which instrument to grab knob.

AF_TAG_MAX
  (int32) Query. Returns maximum raw value of knob.

AF_TAG_MIN
  (int32) Query. Returns minimum raw value of knob.

AF_TAG_NAME
  (const char *) Create, Query. Knob name. On creation, specifies name of knob to grab. On query, returns a pointer to knob's name.

### See Also

``Instrument`, Probe`