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Thank you for purchasing the GL400/350 midi LOGGER. Please read this manual thoroughly before attempting to use your new product to ensure that you use it. Global GL-400 and GL 444, 54 keys electronic keyboard Featuring our Global manual, mic, and adapter 54 keys standard 54 keyboard percussion dual voice/View and Download GRAPHTEC GL400 user manual online. Midi logger. GL400 recording equipment pdf manual download. Also for: Gl350.