| Write/Read | About External Sources | 
| Description | Sets and reads the state of modulation sources having the capability to download modulation files. Modulation distortion control must be ON to control the modulation of an external source. | 
| VB Syntax | extSource.IsEnhancedModulationControl = value | 
| Variable | (Type) - Description | 
| extSource | An ExternalSource Object (object) | 
| value | (Boolean) Choose from: 1 - Enable control of external modulation. 0 - Disable control of external modulation. Learn about these settings and about adding an external source. | 
| Return Type | Boolean | 
| Default | 0 | 
| Examples | extSource.IsEnhancedModulationControl = 1 'Write | 
| value = extSource.IsEnhancedModulationControl 'Read | |
| C++ Syntax | HRESULT put_IsEnhacedModulationControl(VARIANT_BOOL bEnable); HRESULT get_IsEnhancedModulationControl(VARIANT_BOOL* bEnable); | 
| Interface | IExternalSource3 |