morton feldman - beth griffith - three voices

label: edition michael frauenlob bauer - mfb 002
condition: vg+/vg+, overall very clean, but with occasional "interference" sound which i cannot account for by inspecting the grooves, there is a test tone at the start of the record which makes me wonder if i am not correctly calibrated, but anyway the nature of this "interference" is similar to "skipping" cellphone interference. could be a recording issue? but then why release it? it's occasional, and you're not supposed to play this loud anyway...