Following up my previous post on the blues-

You can use the both the blues scale built on I and VI.

That means for Bb instruments (soprano/tenor) you can use either the G blues scale or the E blues scale and later the tritone blues scale or Db/C# blues scale.

For Eb instruments (alto/bari) you can use either the D blues scale or the B blues scale and later the tritone blues scale or Ab blues scale.