# GetNumKnobs

Finds how many knobs an Instrument has.

### Synopsis

`int32 GetNumKnobs (Item Instrument)`

### Description

This function indicates how many knobs an instrument has.

### Arguments

Instrument
  The item number of the instrument.

### Return Value

The function returns the number of knobs if successful (a non-negative value: 0 means no knobs) or an error code (a negative value) if an error occurs.

### Implementation

Folio call implemented in Audio folio V20.

### Associated Files

audio.h

### See Also

``GetKnobName`(), GrabKnob(), Knob`