| Write/Read | About Gain Compression | 
| Description | Set and read the 'Y" value in the delta X/Y compression algorithm. | 
| VB Syntax | gca.CompressionDeltaY = value | 
| Variable | (Type) - Description | 
| gca | A GainCompression (object) | 
| value | (double) - | 
| Return Type | Double | 
| Default | 9 | 
| Examples | gca.CompressionDeltaY = 7 'Write | 
| xDelta = gca.CompressionDeltaY 'Read | |
| C++ Syntax | HRESULT get_CompressionDeltaY(double* pVal) HRESULT put_CompressionDeltaY(double newVal) | 
| Interface | IGainCompression |