cool RE challenge (beginners)

there are 16 registers in the following code's ISA.

register 0 is also special, it's the accumulator; many instructions write to it

"in" and "out" are special- they access "audio registers"

(there's 4: 0 and 1 are input audio, 2 is a constant table; 3 is output audio (Out always writes here))

"seek" and "tell" seek/tell in those audio registers

"filter" is a convolution operation

0000: call		09e2
0001: Filter		1b	2d	f0
0002: Mov		02	02	6c
0003: Mul		5f	bc	69
0004: call		0549
0005: Mul		69	2f	77
0006: In		6c	74	3f
0007: Add		e4	08	6c
0008: Ret		ab	23	84
0009: jmp		0298
000a: Filter		3c	7a	f6
000b: Push		cd	68	07
000c: Filter		2b	cb	e9
000d: Seek		29	85	04
000e: Xor		78	80	a3
000f: Ret		41	24	a0
09e0: Const16		00	d4	f5
09e1: Push		db	01	b2
09e2: Test		e7	a8	df
09e3: call		0aed
09e4: Tell		0b	52	02
09e5: Xor		7d	b3	82
09e6: jif		39	00	a37
09e8: Tell		04	02	e2
09e9: Tell		d7	84	ca
09ea: Mov		2c	db	e0
09eb: Test		4b	00	b6
09ec: Push		d9	7f	dc
09ed: Mov		e8	ff	ff
09ef: Tell		d1	6c	0d
0ae0: Filter		75	65	02
0ae1: Mul		02	05	d6
0ae2: Filter		06	b4	69
0ae3: In		7f	02	b4
0ae4: Test		a5	9e	68
0ae5: Pop		1c	c7	bf
0ae7: Tell		6b	9b	02
0ae8: Sub		6e	42	79
0ae9: call		0013
0aea: In		74	03	a4
0aeb: Add		04	4c	4e
0aec: Tell		a7	6a	a1
0aed: Sub		f1	02	04
0aee: Out		ff	01	ca
0aef: Tell		ee	e1	c5
0af0: Mov		bd	5a	f5
0af1: Const16		11	71	01
0af2: Out		8d	23	6f
0af3: Out		03	f1	00
0af4: Mul		2d	33	00
0af5: In		ad	7f	26
0af6: Out		7b	cf	4d
0af7: call		0afa
0af8: jmp		0afa
0af9: Mul		e1	ff	0d
0afa: Seek		ca	a5	80
0afb: call		0fff
0afc: Mul		d0	04	2d
0afd: Add		a0	00	1a
0afe: Pop		00	80	97
0aff: call		08e1