StrongSoft SS-F1v Flanger is a comprehensive professional flanger featuring accurate metering, spectrum analysis, and detailed LFO visualisation. It features three 'themes' - 'VIN' (vintage), 'MIN' (minimal) and 'SIN' (SSL inspired). It is capable of LFO sync to track tempo using the keypad to the right of the main controls (see screen shots), and the visualisation helps you 'see' exactly what your flanger is doing...