The Synthrotek MST line aims to offer an all-analog monophonic synth voice. Their MST Dual AD/ASR Envelope Generator is surprisingly easy to use, given its complexity. Each channel is normalled to the other for dual cycling operation to achieve unique ping-pong style effects. Additionally, the module contains both normal and inverted envelope outputs that can be modulated in various ways. The inverted envelope has a +5 offset switch, and an attenuator over the output level for fine-tuning.