The Spider Valve Mk II series of amplifiers are designed for live performance environments, especially the 100 watt version of the amp. There are rare use cases where, when the volume is set very low ( like an apartment, or bedroom), and specific combinations of Channel and Master Volume are set, the possibility for popping noises when switching between certain patches is present. These noises are brief and, in most cases, are not very loud, depending on the patch configuration. As this is not the normal use case environment that this amplifier was designed for, Line 6 will not be addressing this specific issue on this model.