For speech rate in settings up/down move by 10, left/right move by 1. Easier to get settings right without having to hold doown the arrow keys lol.

internal/interaction/session.go

@@ -54,6 +54,14 @@ func New_session(form Form) (*Session, error) {
 				return nil, fmt.Errorf("invalid control %q", control.ID)
 			}
 			controlIDs[control.ID] = true
+			if control.Kind == Number {
+				if control.UpDownStep == 0 {
+					control.UpDownStep = 1
+				}
+				if math.IsNaN(control.UpDownStep) || math.IsInf(control.UpDownStep, 0) || control.UpDownStep < 0 {
+					return nil, fmt.Errorf("invalid vertical step %q", control.ID)
+				}
+			}
 			if control.Kind == Number && (math.IsNaN(control.Number) || math.IsInf(control.Number, 0) || math.IsNaN(control.Min) || math.IsInf(control.Min, 0) || math.IsNaN(control.Max) || math.IsInf(control.Max, 0) || math.IsNaN(control.Step) || math.IsInf(control.Step, 0) || control.Min > control.Max || control.Step <= 0 || control.Number < control.Min || control.Number > control.Max) {
 				return nil, fmt.Errorf("invalid range %q", control.ID)
 			}
@@ -244,9 +252,9 @@ func (s *Session) Handle(key Key) Result {
 		delta := 0.0
 		switch key.Name {
 		case "up":
-			delta = 1
+			delta = control.UpDownStep
 		case "down":
-			delta = -1
+			delta = -control.UpDownStep
 		case "right":
 			delta = control.Step
 		case "left":