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https://youlean.co/youlean-loudness-meter/ is a great tool for preset leveling.

As above, but... ears can be tricky, there's PERCEIVED volume (how your ears hear the sound) and actual SPL Volume as measured in decibels. Heavily distorted tones might be PERCEIVED as louder, but because distortion compresses the peaks, clean sounds might actually be louder when measured in decibels. The longer you spend on comparing by ear, the less accurate your ears become - called "ear fatigue". If you go this way, rest your ears frequently. Most modern humans have a smart phone. You can get an app to measure decibels. Not SCIENTIFICALLY accurate, but RELATIVELY accurate and sufficient to the task. You can also use a DAW. In addition to input meters most DAWs have a db meter plugin, or one can be DL'd. This is an even more accurate way than a phone app in that the signal is direct, and therefore not affected by ambient sounds. They also react faster. Someday someone will create an AI to level our tones and protect us from loud music. Skynet to the rescue...

People have repaired it on their own and it's cheap. https://www.thegearpage.net/board/index.php?threads/helix-lt-pedal-sensor-issue.2307568/

You need to perform an activity called level or preset balancing. It’s tedious if you’ve already developed a lot of presets that are not levelled. Search this forum, or Google the concept. Essentially you need to visit every preset and edit them using the amp Channel Volume and Output block Level parameter. These provide clean volume adjustments, as opposed to the Gain/Drive or amp’s Master volume level, all of which affect the tone. Begin with your clean tones and go back and forth among them until your ears tell you their volumes are similar enough. Then proceed to your heavier tones, always comparing back to the clean tones for volume.

When you bypass the effect, the dry signal continues to be passed through the block. Use Snapshots so that you can have either or both fx on, but when they're both off the volume on the fx path is off. Try the attached demo preset. My Powercab is connected using L6 Link, so change the output as necessary for your setup, just don't forget to reassign the Output Block Level to Snapshots and set it to -120db (OFF) on the Dry Only Snapshot. Guus7181.hlx