declared but not used error in miti/src/record/record.go

Incidentally, just tried to compile current master using latest golang 1.19.3 and I get 'declared but not used error' on line  36 of `miti/src/record/record.go`:

```go
patterns := 0
currentPattern := ""
currentState := ""
previousNote := music.NewNote("C", 4) // <--- here
go func() {
```