USAGE NOTES:

File transfer;
To use CP/M PUN: & RDR: 
convert COM files to HEX with UNLOAD.
example:  UNLOAD TEST.COM cr
                 creates TEST.HEX
convert HEX back to COM file use LOAD. 
example:  LOAD TEST.HEX cr
                 creates TEST>COM

Playback sequence:
1.key PIP command ie. PIP TEST.HEX=RDR:[E] cr
2.press play
3.Toggle play switch ON

Record sequence:
1. Toggle Record switch ON
2. Press Record on cassette player
3. Key PIP command ie. PIP PUN:=TEST.HEX[E] cr

Storing large files;
files over 25K split into smaller files with notepad.
for retrieval, concatenate files with PIP.
example: PIP WHOLEFILE.HEX=1STFILE.HEX[ I ],2NDFILE.HEX 

Link to reference for above commands:
http://www.cpm.z80.de/randyfiles/DRI/Intro_to_CPM_Feat_and_Facilities.pdf