Vox and vox in omega excelsis on Lesson One, a sound-poetic, yes, conversation between Claus Haxholm and Audrey Chen, released by Spricht Editions, a new Danish label specializing in “vocal oriented sound.” The duo of Haxholm and Chen work impressive larynx variations, deployed in a playful spot where dolphin clicks meet sizzling eggs and hissing cockroaches. Trilling harmony over reams of glossolalia with a bowl of raspberries and an owl of rasp.