Do you have the feeling that activating HALF POWER MODE doesn't work on your AMP1 because, on the one hand, the leftfoot switch doesn't flash three times after activating HALF POWER MODE and, on the other hand, you only notice a subtle difference to Full Power Mode? Then there is good news for you, because it is unlikely that your AMP1 has an error.
The left footswitch does not flash
The AMP1 Mercury Edition has several software versions that behave differently when it comes to activating the HALF POWER MODE. With the first production batch, you will not receive any visual confirmation when you activate the HALF POWER MODE. With the release of the AMP1 Iridium Edition, we changed the software to allow the left footswitch to flash three times when entering HALF POWER MODE.
This software is installed on all AMP1 Mercury Editions produced in 2019 or later. To find out when your AMP1 Mercury Edition was produced, read this article.
The AMP1 Silver Edition has no Expert Features and therefore no HALF POWER MODE. It only has the PRESET MODE.
The AMP1 Iridium Edition, on the other hand, has even more Expert Features than the AMP1 Mercury Edition. When you activate HALF POWER MODE, you will always receive visual confirmation - the middle footswitch will flash three times.
Is the AMP1 in Direct Access Mode?
Please also make sure that your AMP1 is in Direct Access Mode. The activation of HALF POWER does not work in Preset Mode.
HALF POWER MODE only subtly noticeable
Depending on the position of the MASTER control on the AMP1, it is indeed the case that the HALF POWER MODE is relatively subtle or even imperceptible. You can find out here why this is the case and what the HALF POWER MODE is used for: When the HALF POWER MODE is activated, there is no difference in volume. Why is this?
More AMP1 Expert Features
You can find an overview of the Expert Features and which AMP1 model has which features here: What Expert Features does my AMP1 have?