 
 <prompt> Wetin be di last period wey dem mention for di text? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context:

Translate di text wey dey above go Nigerian pidgin. If e get programming code inside am, leave am as e be. No add any extra statement for your response: <response>: Eventually, wen e dey common for electric recordings to dey play back electrically for di 1930s and 1940s, di overall tone bin dey like as you dey listen to radio for dat time. Magnetic pickups come dey common and dem dey better designed as time dey go, wey make am possible to improve di damping of spurious resonances. Crystal pickups sef dey introduced as lower cost alternatives. Di dynamic or moving coil microphone enter market around 1930 and di velocity or ribbon microphone for 1932. Both of dem high quality microphones come dey widespread for motion picture, radio, recording, and public address applications. 