This SCH-Z has the "Landau Mod" from Vertex effects. The mod includes a true bypass switch, mono and stereo operation, identical specs and tone to ML's chorus, added vibrato voicing and upgraded cosmetics.
Many chorus effects units have poor high frequency response. But the SCH-1 features exclusive tone control that allows the user to boost high frequencies when needed. The SCH-1 uses BBD technology to accomplish a truly superior, low noise chorus effect.