Hi, I'm an intermediate guitarist who has owned a Spider IV amp for a long time and has been souly living off switching between the preset tones on the left dial (Metal, Insane, Twang etc...). I am not an expert and know next to nothing about amplifiers so if you could help me out here, thank you. There's 4 channel buttons at the top which are presets for a certain tone, When I change the tone on that channel, it reverts back to the standard built-in tone and forgets my customisations, how do I get it to save the changes? Sorry if this is extremely vague, the amplifier jargon hasn't sunk in yet. Still learning. Thanks :D