Check the listing for details. Waldorf STVC String Synthesizer and Vocoder. Condition: Very Good - Refurbished. Listed at 749.15 USD. The Streichfett Keyboard The Waldorf Streichfett Keyboard (STVC) is a string synthesizer and vocoder based on the company’s popular Streichfett String Synthesizer. The STVC starts with the String Synth's unique vintage-flavored strings, and adds a smooth-playing aftertouch-enabled 49-note keybed and a bevy of new features that take the Streichfett engine to new levels of sound and performance potential. The STVC is equipped with pitch bend and mod wheels in an all-metal chassis with an OLED display, which lets you easily access the 126 programmable patches in three banks. In addition to the engine enhancements, the STVC adds a new Vocoder function that features outstanding speech intelligibility, a freeze mode, a fully polyphonic carrier, and gender modification.