I know how to do it using DAO, but it should be similar using ADO. In your database, create a field called something like WaveData, with the dbLongBinary type (or OLE_OBJECT as it's called in Access I think). Then you can just read and write the WAV file like this: (DAO sample)

Code:
Dim WS As DAO.Workspace
Dim DB As DAO.Database
Dim RS As DAO.Recordset
Dim bData() As Byte
Dim iFree As Integer

' Open the database, And the 'Waves' table...
Set WS = DBEngine.Workspaces(0)
Set DB = WS.OpenDatabase("c:\wav.mdb")
Set RS = DB.OpenRecordset("Waves")

' Read the WAV file
iFree = FreeFile()
Open "c:\sample.wav" For Binary Access Read As #iFree
ReDim bData(LOF(iFree))
Get #iFree, , bData()
Close #iFree

' Add it To the database
RS.AddNew
RS("WaveData") = bData()
RS.Update

' Now To read it again, move To the first item (To keep it simple)
RS.MoveFirst

' Size the Byte array And read it from the DB
ReDim bData(RS("WaveData").FieldSize)
bData() = RS("WaveData")

' Now you can Write it To a file again, like this:
iFree = FreeFile()
Open "c:\fromdb.wav" For Binary Access Write Lock Read Write As #iFree
Put #iFree, , bData()
Close #iFree

' Close the DB
Set RS = Nothing
Set DB = Nothing
Set WS = Nothing
Hope this helps...