The following cables are compatible with the GK-3 and GK-3B:
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GKC series (13-pin extension cable). Length varies by model (e.g., GKC-5: 15 ft, GKC-10: 30 ft).
Note: GKC-3 (10 ft) has been discontinued. - GKP-2 (parallel cable). Splits the GK signal into two paths, enabling use with two GK-compatible devices (e.g., GR-55, GP-10) at the same time.