Yes, adaptive gain is available in all Roger receivers. Adaptive gain is a feature that adjusts the gain of the Roger signal according to the amount of noise measured by Roger microphone. It’s a way to make sure that the Roger signal remains stronger than the surrounding noise picked up by the hearing aid microphone and it’s based on the assumption that the Roger signal is cleaner (have better signal-to-noise ratio) than the hearing aid signal, and that you would benefit from tilting the balance towards Roger as the noise level goes up.
Easy gain is a feature that lets you adjust the overall gain of the Roger receiver. Say, that you feel that the Roger signal is generally a bit too soft, you can turn it up manually by up to +8dB.
It’s useful to know that both Easy gain and adaptive gain use the same volume control, so to speak. It’s just that the adaptive gain controls it automatically and Easy gain controls it manually. This means that they affect each other. The adaptive gain can increase the gain by a maximum of 20dB in loud noise, but if you have already set the Easy gain to +8dB you have used up 8 of those 20dB, so the adaptive gain would only be able to increase the gain by an additional 12 dB. To complicate things the reverse is not true, i.e. if you’d have the Easy gain set to -8dB you would not get 28 dB adaptive gain as it’s limited to a maximum of 20dB.