The OB-Xa was designed as an enhanced OB-X, aiming to provide more features than its main competitor, the Prophet 5. The OB-Xa had lots of bells and whistles such as chord hold, poly glide, two LFOs and a switchable 2 or 4 pole filter. Above all, the OB-Xa retains the famous Oberheim sound. The OB-Xa excels at beefy leads, lush pads and shimmering strings. 247 Megabytes.