We recommend limiting the total number of shades programmed to a single remote to no more than 12 to ensure consistent and reliable operation. However, we do not impose a specific limit on the number of shades assigned to each channel. The ALL button functions as a single channel and can support all 12 shades without issue. This applies to any other channel as well. As long as the total number of shades does not exceed 12, users have the flexibility to distribute them across channels as desired.