What is gain on guitar amplifier?
Gain is what controls the volume of sound coming from a Megaphone or Guitar Amp. The range it runs on is 0–100%. If the amp is set at 50% and you put your guitar up to 100%, gain will adjust to what level was needed for that 50% perfect signal level.
What happens if gain is too low?
If you have your gain set too low, your amplifier will not be able to reach full power, which could allow the source unit to clip which in turn will result in a distorted signal being delivered to your speakers. This is especially relevant with low voltage sources (lower than 2.5 Volts – typically OEM units).
What is the difference between gain and Overdrive?

Gain is the amount of distortion(signal clipping) added to the signal. Overdrive is just a form of distortion, its a mild form mostly used to over drive the tubes of a tube amp to get a nice tube amp crunch.
What is the difference between gain and volume on a guitar amplifier?
Volume is how loud the OUTPUT of the channel or amp is. It controls loudness, not tone. Gain is how loud the INPUT of the channel or amp is. It controls tone, not loudness.
Is gain the same as amplification?

The amplification factor, also called gain , is the extent to which an analog amplifier boosts the strength of a signal . Amplification factors are usually expressed in terms of power . The decibel (dB), a logarithmic unit, is the most common way of quantifying the gain of an amplifier.
How high should the gain be on my amp?
You will not be able to hear anything yet, since your volume is set to zero. Turn the stereo up to 2/3 the max volume. This is the best range to use when setting gain because you avoid overworking the stereo head. If you overwork the stereo head you could end up sending distorted sounds to your amplifier.
Is gain the same as volume?
Volume is the actual loudness of the output on the channel. It controls the loudness – but not the tone of the audio. Gain is the loudness of the input on the channel. It controls the tone – but does not affect the loudness.