本人学习《VB中频谱分析仪的实现》，下面这一段是该放在哪个子程序里的？
Private Declare Function waveInGetNumDevs Lib "winmm" () As Long
Private Declare Function waveInGetDevCaps Lib "winmm" Alias "waveInGetDevCapsA" (ByVal uDeviceID As Long, ByVal WaveInCapsPointer As Long, ByVal WaveInCapsStructSize As Long) As Long
Private Declare Function waveInGetErrorText Lib "winmm.dll" Alias "waveInGetErrorTextA" (ByVal err As Long, ByVal lpText As String, ByVal uSize As Long) As Long
Private Declare Function waveInOpen Lib "winmm.dll" (lphWaveIn As Long, ByVal uDeviceID As Long, lpFormat As WAVEFORMAT, ByVal dwCallback As Long, ByVal dwInstance As Long, ByVal dwFlags As Long) As Long
Private Declare Function waveInPrepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Private Declare Function waveInReset Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Private Declare Function waveInStart Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Private Declare Function waveInStop Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Private Declare Function waveInUnprepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Private Declare Function waveInClose Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Private Declare Function waveInAddBuffer Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Private Declare Function waveInAddBuff Lib "winmm.dll" Alias "waveInAddBuffer" (ByVal InputDeviceHandle As Long, ByVal WaveHdrPointer As Long, ByVal WaveHdrStructSize As Long) As Long

Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
Private Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
Private Declare Function GlobalUnlock Lib "kernel32" (ByVal hmem As Long) As Long
Private Declare Function timeKillEvent Lib "winmm.dll" (ByVal uID As Long) As Long
Private Declare Function timeSetEvent Lib "winmm.dll" (ByVal uDelay As Long, ByVal uResolution As Long, ByVal lpFunction As Long, ByVal dwUser As Long, ByVal uFlags As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Sub CopyStringFromStruct Lib "kernel32" Alias "RtlMoveMemory" (ByVal a As String, P As Any, ByVal cb As Long)
Private Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" (struct As Any, ByVal ptr As Long, ByVal cb As Long)
Private Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" (ByVal ptr As Long, struct As Any, ByVal cb As Long)
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByRef lParam As WAVEHDR) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private m_sErrMsg As String * 256   '// 保存错误消息
Private m_hWaveIn As Long           '// 波形输出设备句柄
Private m_wFormat As WAVEFORMAT     '//
Private m_inHdr As WAVEHDR          '//
Private m_hMem As Long              '// 指向分配的内存块的指针
Private m_lBuffersize As Long       '// 存放波形数据的缓存大小
Private m_InData() As Byte          '// 波形数据
Private m_lngRetVal As Long
Private m_CellSpace As Long
Private m_CellWidth As Long
Private m_BarCounts As Long
Private m_ForeColor As Long
Private m_BackColor As Long