PC World Sell Roland USB Midi converters, but they're about £40 if memory serves. Might be cheaper to pick up a £10 sound card with a Joystick port on it and continue to use your old cables.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.