Sorry, no online dictionaries contain the exact phrase erstwhile sound systems.
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Reverse dictionary results:
1. obsolete
2. outdated
3. old-fashioned
4. antiquated
5. demoded
6. moded
7. stale
8. superannuated
9. dated
10. fossilized
11. reminiscent
12. well-preserved
13. antiently
14. arcane
15. classic
16. cobwebbed
17. undated
18. ancient
19. ancientness
20. antiquate
21. antiqueness
22. eld
23. nostalgic
24. old-time
25. relic
26. relictual
27. vieux jeu
28. vintage
29. anagraph
30. ancient history
31. anciently
32. antediluvian
33. antic
34. antick
35. antient
36. antique
37. antiquer

You can look up the words in the phrase individually using these links:   erstwhile ?   sound ?   systems ?
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erst*to search for words beginning with erst, or
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