Руководства пользователя

• [Russian]FR-4x Practice Guide

• [Русский] FR-4x Руководство пользователя

• [English] FR-4x Owner's Manual

• [English] FR-4x Reference Manual

• [English] FR-4x Tone & Drum Kit List

• [English] Supplementary Explanation of the FR-4x/4xb Reed Combinations