Assembly: Bass.Net (in Bass.Net.dll) Version: 22.214.171.124
Property ValueType: Double
Values between 0.0 and less than 1.0 will actually be an attenuation of the signal level.
Values above 1.0 will actually be an amplification of the signal level, whereas a value of exactly 1.0 will leave the signal level unmodified.
The gain can also be applied via Gain_dBV (dB, Min.: -Infinity, Max.: +60, no amplification at a value of 0.0).